; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -passes=debugify,loop-idiom -mtriple=x86_64 -mcpu=core-avx2 < %s -S | FileCheck --check-prefixes=ALL,LZCNT %s ; RUN: opt -passes=debugify,loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck --check-prefixes=ALL,NOLZCNT %s declare i32 @gen32() declare void @use32(i32) declare void @use1(i1) declare void @external_side_effect() ; The patterns here are all have the same base form: ; while (!(x & (1U << bit))) ; x <<= 1; ; .. which is an uncountable loop. ; We should transform it into it's countable form. ; Most basic example. define i32 @p0_i32(i32 %x, i32 %bit) { ; LZCNT-LABEL: @p0_i32( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG16:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META9:![0-9]+]], !DIExpression(), [[DBG16]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG17:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG17]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG17]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG17]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG17]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG17]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG17]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG17]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG17]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG17]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG18:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG17]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG17]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META11:![0-9]+]], !DIExpression(), [[DBG17]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG19:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META12:![0-9]+]], !DIExpression(), [[DBG19]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG20:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META13:![0-9]+]], !DIExpression(), [[DBG20]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG21:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META15:![0-9]+]], !DIExpression(), [[DBG21]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG22:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG22]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG22]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG17]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG23:![0-9]+]] ; ; NOLZCNT-LABEL: @p0_i32( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG16:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META9:![0-9]+]], !DIExpression(), [[DBG16]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG17:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG18:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META11:![0-9]+]], !DIExpression(), [[DBG18]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG19:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META12:![0-9]+]], !DIExpression(), [[DBG19]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG20:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META13:![0-9]+]], !DIExpression(), [[DBG20]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG21:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META15:![0-9]+]], !DIExpression(), [[DBG21]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG22:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG18]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG23:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Same, but in some other bit width. define i16 @p1_i16(i16 %x, i16 %bit) { ; LZCNT-LABEL: @p1_i16( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i16 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i16 1, [[BIT_FR]], !dbg [[DBG32:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i16 [[BITMASK]], [[META26:![0-9]+]], !DIExpression(), [[DBG32]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i16 [[BITMASK]], -1, !dbg [[DBG33:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i16 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG33]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i16 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG33]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i16 @llvm.ctlz.i16(i16 [[X_MASKED]], i1 true), !dbg [[DBG33]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i16 16, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG33]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i16 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG33]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i16 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG33]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i16 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG33]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i16 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG33]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i16 [[X_CURR]], 1, !dbg [[DBG33]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG34:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG33]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i16 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG33]] ; LZCNT-NEXT: #dbg_value(i16 [[TMP0]], [[META28:![0-9]+]], !DIExpression(), [[DBG33]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i16 [[TMP0]], [[BITMASK]], !dbg [[DBG35:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i16 [[X_CURR_BITMASKED]], [[META29:![0-9]+]], !DIExpression(), [[DBG35]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i16 [[X_CURR_BITMASKED]], 0, !dbg [[DBG36:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META30:![0-9]+]], !DIExpression(), [[DBG36]]) ; LZCNT-NEXT: [[TMP1]] = shl i16 [[TMP0]], 1, !dbg [[DBG37:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i16 [[TMP1]], [[META31:![0-9]+]], !DIExpression(), [[DBG37]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i16 [[LOOP_IV]], 1, !dbg [[DBG38:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i16 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG38]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG38]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i16 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG33]] ; LZCNT-NEXT: ret i16 [[X_CURR_LCSSA]], !dbg [[DBG39:![0-9]+]] ; ; NOLZCNT-LABEL: @p1_i16( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i16 1, [[BIT:%.*]], !dbg [[DBG32:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i16 [[BITMASK]], [[META26:![0-9]+]], !DIExpression(), [[DBG32]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG33:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i16 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG34:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i16 [[X_CURR]], [[META28:![0-9]+]], !DIExpression(), [[DBG34]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i16 [[X_CURR]], [[BITMASK]], !dbg [[DBG35:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i16 [[X_CURR_BITMASKED]], [[META29:![0-9]+]], !DIExpression(), [[DBG35]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i16 [[X_CURR_BITMASKED]], 0, !dbg [[DBG36:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META30:![0-9]+]], !DIExpression(), [[DBG36]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i16 [[X_CURR]], 1, !dbg [[DBG37:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i16 [[X_NEXT]], [[META31:![0-9]+]], !DIExpression(), [[DBG37]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG38:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i16 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG34]] ; NOLZCNT-NEXT: ret i16 [[X_CURR_LCSSA]], !dbg [[DBG39:![0-9]+]] ; entry: %bitmask = shl i16 1, %bit br label %loop loop: %x.curr = phi i16 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i16 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i16 %x.curr.bitmasked, 0 %x.next = shl i16 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i16 %x.curr } ; We don't particularly care whether %x.curr or %x.curr will live-out. define i32 @p2_different_liveout(i32 %x, i32 %bit) { ; LZCNT-LABEL: @p2_different_liveout( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG47:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META42:![0-9]+]], !DIExpression(), [[DBG47]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG48:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG48]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG48]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG48]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG48]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG48]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG48]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG48]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG48]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG48]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG49:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG48]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG48]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META43:![0-9]+]], !DIExpression(), [[DBG48]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG50:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META44:![0-9]+]], !DIExpression(), [[DBG50]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG51:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META45:![0-9]+]], !DIExpression(), [[DBG51]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG52:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META46:![0-9]+]], !DIExpression(), [[DBG52]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG53:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG53]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG53]] ; LZCNT: end: ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG52]] ; LZCNT-NEXT: ret i32 [[X_NEXT_LCSSA]], !dbg [[DBG54:![0-9]+]] ; ; NOLZCNT-LABEL: @p2_different_liveout( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG47:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META42:![0-9]+]], !DIExpression(), [[DBG47]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG48:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG49:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META43:![0-9]+]], !DIExpression(), [[DBG49]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG50:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META44:![0-9]+]], !DIExpression(), [[DBG50]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG51:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META45:![0-9]+]], !DIExpression(), [[DBG51]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG52:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META46:![0-9]+]], !DIExpression(), [[DBG52]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG53:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG52]] ; NOLZCNT-NEXT: ret i32 [[X_NEXT_LCSSA]], !dbg [[DBG54:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.next ; not %x.curr } ; Even both of them can liveout define void @p3_constant_mask_24thbit(i32 %x, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p3_constant_mask_24thbit( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], 33554431, !dbg [[DBG61:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG61]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG61]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG61]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 24, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG61]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG61]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG61]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X]], [[LOOP_TRIPCOUNT]], !dbg [[DBG61]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG62:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG61]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG61]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META57:![0-9]+]], !DIExpression(), [[DBG61]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], 16777216, !dbg [[DBG63:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META58:![0-9]+]], !DIExpression(), [[DBG63]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG64:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META59:![0-9]+]], !DIExpression(), [[DBG64]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG65:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META60:![0-9]+]], !DIExpression(), [[DBG65]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG66:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG66]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG66]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG61]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG65]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG67:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG68:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG69:![0-9]+]] ; ; NOLZCNT-LABEL: @p3_constant_mask_24thbit( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG61:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG62:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META57:![0-9]+]], !DIExpression(), [[DBG62]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], 16777216, !dbg [[DBG63:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META58:![0-9]+]], !DIExpression(), [[DBG63]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG64:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META59:![0-9]+]], !DIExpression(), [[DBG64]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG65:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META60:![0-9]+]], !DIExpression(), [[DBG65]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG66:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG62]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG65]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG67:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG68:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG69:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 16777216 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p4_constant_mask_15thbit(i32 %x, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p4_constant_mask_15thbit( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], 65535, !dbg [[DBG76:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG76]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG76]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG76]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 15, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG76]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG76]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG76]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X]], [[LOOP_TRIPCOUNT]], !dbg [[DBG76]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG77:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG76]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG76]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META72:![0-9]+]], !DIExpression(), [[DBG76]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], 32768, !dbg [[DBG78:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META73:![0-9]+]], !DIExpression(), [[DBG78]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG79:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META74:![0-9]+]], !DIExpression(), [[DBG79]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG80:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META75:![0-9]+]], !DIExpression(), [[DBG80]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG81:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG81]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG81]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG76]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG80]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG82:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG83:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG84:![0-9]+]] ; ; NOLZCNT-LABEL: @p4_constant_mask_15thbit( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG76:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG77:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META72:![0-9]+]], !DIExpression(), [[DBG77]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], 32768, !dbg [[DBG78:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META73:![0-9]+]], !DIExpression(), [[DBG78]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG79:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META74:![0-9]+]], !DIExpression(), [[DBG79]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG80:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META75:![0-9]+]], !DIExpression(), [[DBG80]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG81:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG77]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG80]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG82:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG83:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG84:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 32768 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } ; All no-wrap flags can be kept on the shift. define void @p5_nuw(i32 %x, i32 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p5_nuw( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG92:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META87:![0-9]+]], !DIExpression(), [[DBG92]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG93:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG93]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG93]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG93]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG93]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG93]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG93]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG93]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl nuw i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG93]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl nuw i32 [[X]], [[LOOP_TRIPCOUNT]], !dbg [[DBG93]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG94:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG93]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG93]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META88:![0-9]+]], !DIExpression(), [[DBG93]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG95:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META89:![0-9]+]], !DIExpression(), [[DBG95]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG96:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META90:![0-9]+]], !DIExpression(), [[DBG96]]) ; LZCNT-NEXT: [[TMP1]] = shl nuw i32 [[TMP0]], 1, !dbg [[DBG97:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META91:![0-9]+]], !DIExpression(), [[DBG97]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG98:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG98]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG98]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG93]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG97]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG99:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG100:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG101:![0-9]+]] ; ; NOLZCNT-LABEL: @p5_nuw( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG92:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META87:![0-9]+]], !DIExpression(), [[DBG92]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG93:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG94:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META88:![0-9]+]], !DIExpression(), [[DBG94]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG95:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META89:![0-9]+]], !DIExpression(), [[DBG95]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG96:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META90:![0-9]+]], !DIExpression(), [[DBG96]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl nuw i32 [[X_CURR]], 1, !dbg [[DBG97:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META91:![0-9]+]], !DIExpression(), [[DBG97]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG98:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG94]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG97]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG99:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG100:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG101:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl nuw i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p6_nsw(i32 %x, i32 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p6_nsw( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG109:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META104:![0-9]+]], !DIExpression(), [[DBG109]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG110:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG110]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG110]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG110]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG110]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG110]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG110]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG110]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl nsw i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG110]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl nsw i32 [[X]], [[LOOP_TRIPCOUNT]], !dbg [[DBG110]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG111:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG110]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG110]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META105:![0-9]+]], !DIExpression(), [[DBG110]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG112:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META106:![0-9]+]], !DIExpression(), [[DBG112]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG113:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META107:![0-9]+]], !DIExpression(), [[DBG113]]) ; LZCNT-NEXT: [[TMP1]] = shl nsw i32 [[TMP0]], 1, !dbg [[DBG114:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META108:![0-9]+]], !DIExpression(), [[DBG114]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG115:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG115]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG115]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG110]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG114]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG116:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG117:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG118:![0-9]+]] ; ; NOLZCNT-LABEL: @p6_nsw( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG109:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META104:![0-9]+]], !DIExpression(), [[DBG109]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG110:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG111:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META105:![0-9]+]], !DIExpression(), [[DBG111]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG112:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META106:![0-9]+]], !DIExpression(), [[DBG112]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG113:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META107:![0-9]+]], !DIExpression(), [[DBG113]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl nsw i32 [[X_CURR]], 1, !dbg [[DBG114:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META108:![0-9]+]], !DIExpression(), [[DBG114]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG115:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG111]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG114]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG116:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG117:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG118:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl nsw i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p7_nuwnsw(i32 %x, i32 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p7_nuwnsw( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG126:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META121:![0-9]+]], !DIExpression(), [[DBG126]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG127:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG127]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG127]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG127]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG127]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG127]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG127]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG127]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl nuw nsw i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG127]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl nuw nsw i32 [[X]], [[LOOP_TRIPCOUNT]], !dbg [[DBG127]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG128:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG127]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG127]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META122:![0-9]+]], !DIExpression(), [[DBG127]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG129:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META123:![0-9]+]], !DIExpression(), [[DBG129]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG130:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META124:![0-9]+]], !DIExpression(), [[DBG130]]) ; LZCNT-NEXT: [[TMP1]] = shl nuw nsw i32 [[TMP0]], 1, !dbg [[DBG131:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META125:![0-9]+]], !DIExpression(), [[DBG131]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG132:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG132]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG132]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG127]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG131]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG133:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG134:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG135:![0-9]+]] ; ; NOLZCNT-LABEL: @p7_nuwnsw( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG126:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META121:![0-9]+]], !DIExpression(), [[DBG126]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG127:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG128:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META122:![0-9]+]], !DIExpression(), [[DBG128]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG129:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META123:![0-9]+]], !DIExpression(), [[DBG129]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG130:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META124:![0-9]+]], !DIExpression(), [[DBG130]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl nuw nsw i32 [[X_CURR]], 1, !dbg [[DBG131:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META125:![0-9]+]], !DIExpression(), [[DBG131]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG132:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG128]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG131]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG133:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG134:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG135:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl nuw nsw i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p8_constant_mask_signbit_noncanonical(i32 %x, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p8_constant_mask_signbit_noncanonical( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], -1, !dbg [[DBG142:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG142]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG142]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG142]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 31, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG142]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG142]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG142]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG142]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG143:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG142]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG142]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META138:![0-9]+]], !DIExpression(), [[DBG142]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], -2147483648, !dbg [[DBG144:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META139:![0-9]+]], !DIExpression(), [[DBG144]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG145:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META140:![0-9]+]], !DIExpression(), [[DBG145]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG146:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META141:![0-9]+]], !DIExpression(), [[DBG146]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG147:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG147]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG147]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG142]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG146]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG148:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG149:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG150:![0-9]+]] ; ; NOLZCNT-LABEL: @p8_constant_mask_signbit_noncanonical( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG142:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG143:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META138:![0-9]+]], !DIExpression(), [[DBG143]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], -2147483648, !dbg [[DBG144:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META139:![0-9]+]], !DIExpression(), [[DBG144]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG145:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META140:![0-9]+]], !DIExpression(), [[DBG145]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG146:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META141:![0-9]+]], !DIExpression(), [[DBG146]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG147:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG143]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG146]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG148:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG149:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG150:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 2147483648 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p9_constant_mask_signbit_canonical(i32 %x, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p9_constant_mask_signbit_canonical( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], -1, !dbg [[DBG156:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG156]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG156]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG156]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 31, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG156]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG156]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG156]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG156]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG157:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG156]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG156]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META153:![0-9]+]], !DIExpression(), [[DBG156]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp sgt i32 [[TMP0]], -1, !dbg [[DBG158:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META154:![0-9]+]], !DIExpression(), [[DBG158]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG159:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META155:![0-9]+]], !DIExpression(), [[DBG159]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG160:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG160]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG160]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG156]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG159]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG161:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG162:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG163:![0-9]+]] ; ; NOLZCNT-LABEL: @p9_constant_mask_signbit_canonical( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG156:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG157:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META153:![0-9]+]], !DIExpression(), [[DBG157]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp sgt i32 [[X_CURR]], -1, !dbg [[DBG158:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META154:![0-9]+]], !DIExpression(), [[DBG158]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG159:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META155:![0-9]+]], !DIExpression(), [[DBG159]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG160:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG157]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG159]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG161:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG162:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG163:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.isbitunset = icmp sgt i32 %x.curr, -1 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } define void @p10_x_is_not_one(i32 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @p10_x_is_not_one( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG171:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META166:![0-9]+]], !DIExpression(), [[DBG171]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG172:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG172]] ; LZCNT-NEXT: [[DOTMASKED:%.*]] = and i32 2, [[BIT_FR_MASK]], !dbg [[DBG172]] ; LZCNT-NEXT: [[DOTMASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[DOTMASKED]], i1 true), !dbg [[DBG172]] ; LZCNT-NEXT: [[DOTMASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[DOTMASKED_NUMLEADINGZEROS]], !dbg [[DBG172]] ; LZCNT-NEXT: [[DOTMASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[DOTMASKED_NUMACTIVEBITS]], -1, !dbg [[DBG172]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[DOTMASKED_LEADINGONEPOS]], !dbg [[DBG172]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG172]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 2, [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG172]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG172]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG173:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG172]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ 2, [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG172]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META167:![0-9]+]], !DIExpression(), [[DBG172]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG174:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META168:![0-9]+]], !DIExpression(), [[DBG174]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG175:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META169:![0-9]+]], !DIExpression(), [[DBG175]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG176:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META170:![0-9]+]], !DIExpression(), [[DBG176]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG177:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG177]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG177]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG172]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG176]] ; LZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG178:![0-9]+]] ; LZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG179:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG180:![0-9]+]] ; ; NOLZCNT-LABEL: @p10_x_is_not_one( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG171:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META166:![0-9]+]], !DIExpression(), [[DBG171]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG172:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG173:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META167:![0-9]+]], !DIExpression(), [[DBG173]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG174:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META168:![0-9]+]], !DIExpression(), [[DBG174]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG175:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META169:![0-9]+]], !DIExpression(), [[DBG175]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG176:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META170:![0-9]+]], !DIExpression(), [[DBG176]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG177:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG173]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i32 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG176]] ; NOLZCNT-NEXT: store i32 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 4, !dbg [[DBG178:![0-9]+]] ; NOLZCNT-NEXT: store i32 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 4, !dbg [[DBG179:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG180:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ 2, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i32 %x.curr, ptr %p0 store i32 %x.next, ptr %p1 ret void } ; Check that loop backedge's cmp-br order is correctly handled define i32 @p11(i32 %x, i32 %bit) { ; LZCNT-LABEL: @p11( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG188:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META183:![0-9]+]], !DIExpression(), [[DBG188]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG189:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG189]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG189]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG189]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG189]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG189]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG189]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG189]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG189]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG189]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG190:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG189]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG189]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META184:![0-9]+]], !DIExpression(), [[DBG189]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG191:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META185:![0-9]+]], !DIExpression(), [[DBG191]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp ne i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG192:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META186:![0-9]+]], !DIExpression(), [[DBG192]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG193:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META187:![0-9]+]], !DIExpression(), [[DBG193]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG194:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG194]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG194]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG189]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG195:![0-9]+]] ; ; NOLZCNT-LABEL: @p11( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG188:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META183:![0-9]+]], !DIExpression(), [[DBG188]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG189:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG190:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META184:![0-9]+]], !DIExpression(), [[DBG190]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG191:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META185:![0-9]+]], !DIExpression(), [[DBG191]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp ne i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG192:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META186:![0-9]+]], !DIExpression(), [[DBG192]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG193:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META187:![0-9]+]], !DIExpression(), [[DBG193]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG194:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG190]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG195:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp ne i32 %x.curr.bitmasked, 0 ; swapped predicate %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %end, label %loop ; swapped dests end: ret i32 %x.curr } ; `and` is commutative, so ensure that order is irrelevant define i32 @p12(i32 %x, i32 %bit) { ; LZCNT-LABEL: @p12( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG203:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META198:![0-9]+]], !DIExpression(), [[DBG203]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG204:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG204]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG204]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG204]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG204]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG204]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG204]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG204]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG204]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG204]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG205:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG204]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG204]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META199:![0-9]+]], !DIExpression(), [[DBG204]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[BITMASK]], [[TMP0]], !dbg [[DBG206:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META200:![0-9]+]], !DIExpression(), [[DBG206]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG207:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META201:![0-9]+]], !DIExpression(), [[DBG207]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG208:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META202:![0-9]+]], !DIExpression(), [[DBG208]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG209:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG209]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG209]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG204]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG210:![0-9]+]] ; ; NOLZCNT-LABEL: @p12( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG203:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META198:![0-9]+]], !DIExpression(), [[DBG203]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG204:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG205:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META199:![0-9]+]], !DIExpression(), [[DBG205]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[BITMASK]], [[X_CURR]], !dbg [[DBG206:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META200:![0-9]+]], !DIExpression(), [[DBG206]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG207:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META201:![0-9]+]], !DIExpression(), [[DBG207]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG208:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META202:![0-9]+]], !DIExpression(), [[DBG208]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG209:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG205]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG210:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %bitmask, %x.curr ; swapped %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; PHI node does not have any particular order for it's incomings, ; but check that the other order still works. define i32 @p13(i32 %x, i32 %bit) { ; LZCNT-LABEL: @p13( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG218:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META213:![0-9]+]], !DIExpression(), [[DBG218]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG219:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG219]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG219]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG219]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG219]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG219]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG219]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG219]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG219]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG219]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG220:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG219]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[TMP1:%.*]], [[LOOP]] ], [ [[X]], [[ENTRY]] ], !dbg [[DBG219]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META214:![0-9]+]], !DIExpression(), [[DBG219]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG221:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META215:![0-9]+]], !DIExpression(), [[DBG221]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG222:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META216:![0-9]+]], !DIExpression(), [[DBG222]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG223:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META217:![0-9]+]], !DIExpression(), [[DBG223]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG224:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG224]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG224]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG219]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG225:![0-9]+]] ; ; NOLZCNT-LABEL: @p13( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG218:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META213:![0-9]+]], !DIExpression(), [[DBG218]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG219:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X_NEXT:%.*]], [[LOOP]] ], [ [[X:%.*]], [[ENTRY:%.*]] ], !dbg [[DBG220:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META214:![0-9]+]], !DIExpression(), [[DBG220]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG221:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META215:![0-9]+]], !DIExpression(), [[DBG221]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG222:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META216:![0-9]+]], !DIExpression(), [[DBG222]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG223:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META217:![0-9]+]], !DIExpression(), [[DBG223]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG224:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG220]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG225:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x.next, %loop ], [ %x, %entry ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; ICmp-Br are commutative define i32 @p14(i32 %x) { ; LZCNT-LABEL: @p14( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], -1, !dbg [[DBG231:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG231]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG231]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG231]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 31, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG231]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG231]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG231]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG231]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG232:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG231]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG231]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META228:![0-9]+]], !DIExpression(), [[DBG231]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp slt i32 [[TMP0]], 0, !dbg [[DBG233:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META229:![0-9]+]], !DIExpression(), [[DBG233]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG234:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META230:![0-9]+]], !DIExpression(), [[DBG234]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG235:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG235]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG235]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG231]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG236:![0-9]+]] ; ; NOLZCNT-LABEL: @p14( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG231:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG232:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META228:![0-9]+]], !DIExpression(), [[DBG232]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp slt i32 [[X_CURR]], 0, !dbg [[DBG233:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META229:![0-9]+]], !DIExpression(), [[DBG233]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG234:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META230:![0-9]+]], !DIExpression(), [[DBG234]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG235:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG232]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG236:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.isbitunset = icmp slt i32 %x.curr, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %end, label %loop end: ret i32 %x.curr } ;------------------------------------------------------------------------------- ; Negative tests ; The %bitmask must be outside of the loop. define i32 @n15(i32 %x, i32 %bit) { ; ALL-LABEL: @n15( ; ALL-NEXT: entry: ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG244:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG245:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META239:![0-9]+]], !DIExpression(), [[DBG245]]) ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG246:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META240:![0-9]+]], !DIExpression(), [[DBG246]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG247:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META241:![0-9]+]], !DIExpression(), [[DBG247]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG248:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META242:![0-9]+]], !DIExpression(), [[DBG248]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG249:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META243:![0-9]+]], !DIExpression(), [[DBG249]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG250:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG245]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG251:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %bitmask = shl i32 1, %bit ; not loop-invariant %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; The %bitmask must be loop-invariant define i32 @n16(i32 %x, i32 %bit) { ; ALL-LABEL: @n16( ; ALL-NEXT: entry: ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG259:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG260:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META254:![0-9]+]], !DIExpression(), [[DBG260]]) ; ALL-NEXT: [[BITMASK:%.*]] = call i32 @gen32(), !dbg [[DBG261:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META255:![0-9]+]], !DIExpression(), [[DBG261]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG262:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META256:![0-9]+]], !DIExpression(), [[DBG262]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG263:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META257:![0-9]+]], !DIExpression(), [[DBG263]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG264:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META258:![0-9]+]], !DIExpression(), [[DBG264]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG265:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG260]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG266:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %bitmask = call i32 @gen32() ; really not loop-invariant %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; The %bitmask must be a left-shift of a single bit. define i32 @n17(i32 %x, i32 %bit) { ; ALL-LABEL: @n17( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 2, [[BIT:%.*]], !dbg [[DBG274:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META269:![0-9]+]], !DIExpression(), [[DBG274]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG275:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG276:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META270:![0-9]+]], !DIExpression(), [[DBG276]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG277:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META271:![0-9]+]], !DIExpression(), [[DBG277]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG278:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META272:![0-9]+]], !DIExpression(), [[DBG278]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG279:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META273:![0-9]+]], !DIExpression(), [[DBG279]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG280:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG276]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG281:![0-9]+]] ; entry: %bitmask = shl i32 2, %bit ; not what we are looking for. br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Bad recurrence - should be a left-shift by 1. define i32 @n18(i32 %x, i32 %bit) { ; ALL-LABEL: @n18( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG289:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META284:![0-9]+]], !DIExpression(), [[DBG289]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG290:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG291:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META285:![0-9]+]], !DIExpression(), [[DBG291]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG292:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META286:![0-9]+]], !DIExpression(), [[DBG292]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG293:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META287:![0-9]+]], !DIExpression(), [[DBG293]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 2, !dbg [[DBG294:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META288:![0-9]+]], !DIExpression(), [[DBG294]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG295:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG291]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG296:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 2 ; wrong shift amount. br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; The comparison is not what we are looking for. define i32 @n19(i32 %x, i32 %bit) { ; ALL-LABEL: @n19( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG304:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META299:![0-9]+]], !DIExpression(), [[DBG304]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG305:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG306:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META300:![0-9]+]], !DIExpression(), [[DBG306]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG307:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META301:![0-9]+]], !DIExpression(), [[DBG307]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp ne i32 [[X_CURR_BITMASKED]], [[BITMASK]], !dbg [[DBG308:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META302:![0-9]+]], !DIExpression(), [[DBG308]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG309:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META303:![0-9]+]], !DIExpression(), [[DBG309]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG310:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG306]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG311:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp ne i32 %x.curr.bitmasked, %bitmask ; should be `==0` %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; We should loop while %x.curr.bitmasked is 0, not exit when it is 0. define i32 @n20(i32 %x, i32 %bit) { ; ALL-LABEL: @n20( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG319:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META314:![0-9]+]], !DIExpression(), [[DBG319]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG320:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG321:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META315:![0-9]+]], !DIExpression(), [[DBG321]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG322:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META316:![0-9]+]], !DIExpression(), [[DBG322]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG323:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META317:![0-9]+]], !DIExpression(), [[DBG323]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG324:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META318:![0-9]+]], !DIExpression(), [[DBG324]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG325:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG321]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG326:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %end, label %loop ; wrong order of successors end: ret i32 %x.curr } ; We should loop while %x.curr.bitmasked is 0, not while it is not 0. define i32 @n21(i32 %x, i32 %bit) { ; ALL-LABEL: @n21( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG334:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META329:![0-9]+]], !DIExpression(), [[DBG334]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG335:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG336:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META330:![0-9]+]], !DIExpression(), [[DBG336]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG337:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META331:![0-9]+]], !DIExpression(), [[DBG337]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp ne i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG338:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META332:![0-9]+]], !DIExpression(), [[DBG338]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG339:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META333:![0-9]+]], !DIExpression(), [[DBG339]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG340:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG336]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG341:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp ne i32 %x.curr.bitmasked, 0 ; wrong predicate %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; PHI node is not a recurrence define i32 @n22(i32 %x, i32 %bit) { ; ALL-LABEL: @n22( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG349:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META344:![0-9]+]], !DIExpression(), [[DBG349]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG350:![0-9]+]] ; ALL: loop: ; ALL-NEXT: #dbg_value(i32 [[X:%.*]], [[META345:![0-9]+]], !DIExpression(), [[META351:![0-9]+]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X]], [[BITMASK]], !dbg [[DBG352:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META346:![0-9]+]], !DIExpression(), [[DBG352]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG353:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META347:![0-9]+]], !DIExpression(), [[DBG353]]) ; ALL-NEXT: [[X_NEXT:%.*]] = shl i32 [[X]], 1, !dbg [[DBG354:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META348:![0-9]+]], !DIExpression(), [[DBG354]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG355:![0-9]+]] ; ALL: end: ; ALL-NEXT: ret i32 [[X]], !dbg [[DBG356:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x, %loop ] ; should use %x.next when coming from %loop %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Masking wrong value define i32 @n23(i32 %x, i32 %bit) { ; ALL-LABEL: @n23( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG364:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META359:![0-9]+]], !DIExpression(), [[DBG364]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG365:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG366:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META360:![0-9]+]], !DIExpression(), [[DBG366]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X]], [[BITMASK]], !dbg [[DBG367:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META361:![0-9]+]], !DIExpression(), [[DBG367]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG368:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META362:![0-9]+]], !DIExpression(), [[DBG368]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG369:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META363:![0-9]+]], !DIExpression(), [[DBG369]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG370:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG366]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG371:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x, %bitmask ; should use %x.curr, not %x %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Checking wrong value define i32 @n24(i32 %x, i32 %bit) { ; ALL-LABEL: @n24( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG379:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META374:![0-9]+]], !DIExpression(), [[DBG379]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG380:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG381:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META375:![0-9]+]], !DIExpression(), [[DBG381]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG382:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META376:![0-9]+]], !DIExpression(), [[DBG382]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR]], 0, !dbg [[DBG383:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META377:![0-9]+]], !DIExpression(), [[DBG383]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG384:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META378:![0-9]+]], !DIExpression(), [[DBG384]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG385:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG381]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG386:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr, 0 ; should be checking %x.curr.bitmasked %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Shifting wrong value define i32 @n25(i32 %x, i32 %bit) { ; ALL-LABEL: @n25( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG394:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META389:![0-9]+]], !DIExpression(), [[DBG394]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG395:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG396:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META390:![0-9]+]], !DIExpression(), [[DBG396]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG397:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META391:![0-9]+]], !DIExpression(), [[DBG397]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG398:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META392:![0-9]+]], !DIExpression(), [[DBG398]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X]], 1, !dbg [[DBG399:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META393:![0-9]+]], !DIExpression(), [[DBG399]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG400:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG396]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG401:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x, 1 ; should be shifting %x.curr br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Bit mask is not a power of 2 define i32 @n26(i32 %x) { ; ALL-LABEL: @n26( ; ALL-NEXT: entry: ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG408:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG409:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META404:![0-9]+]], !DIExpression(), [[DBG409]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], 16777215, !dbg [[DBG410:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META405:![0-9]+]], !DIExpression(), [[DBG410]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG411:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META406:![0-9]+]], !DIExpression(), [[DBG411]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG412:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META407:![0-9]+]], !DIExpression(), [[DBG412]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG413:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG409]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG414:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 16777215 ; not a power of 2 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Bit mask is not a power of 2 define i32 @n27(i32 %x) { ; ALL-LABEL: @n27( ; ALL-NEXT: entry: ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG421:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG422:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META417:![0-9]+]], !DIExpression(), [[DBG422]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], 384, !dbg [[DBG423:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META418:![0-9]+]], !DIExpression(), [[DBG423]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG424:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META419:![0-9]+]], !DIExpression(), [[DBG424]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG425:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META420:![0-9]+]], !DIExpression(), [[DBG425]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG426:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG422]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG427:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 384 ; not a power of 2 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Bit mask is not a power of 2 define i32 @n28(i32 %x) { ; ALL-LABEL: @n28( ; ALL-NEXT: entry: ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG434:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG435:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META430:![0-9]+]], !DIExpression(), [[DBG435]]) ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], 32896, !dbg [[DBG436:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META431:![0-9]+]], !DIExpression(), [[DBG436]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG437:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META432:![0-9]+]], !DIExpression(), [[DBG437]]) ; ALL-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG438:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META433:![0-9]+]], !DIExpression(), [[DBG438]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG439:![0-9]+]] ; ALL: end: ; ALL-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG435]] ; ALL-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG440:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, 32896 ; not a power of 2 %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ;------------------------------------------------------------------------------- ; Tests with extra cruft. ; If loop body has any extra instructions we don't want to deal with it. define i32 @n29(i32 %x, i32 %bit) { ; LZCNT-LABEL: @n29( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG448:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META443:![0-9]+]], !DIExpression(), [[DBG448]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG449:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG449]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG449]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG449]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG449]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG449]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG449]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG449]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG449]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG449]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG450:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG449]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG449]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META444:![0-9]+]], !DIExpression(), [[DBG449]]) ; LZCNT-NEXT: call void @external_side_effect(), !dbg [[DBG451:![0-9]+]] ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG452:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META445:![0-9]+]], !DIExpression(), [[DBG452]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG453:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META446:![0-9]+]], !DIExpression(), [[DBG453]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG454:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META447:![0-9]+]], !DIExpression(), [[DBG454]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG455:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG455]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG455]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG449]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG456:![0-9]+]] ; ; NOLZCNT-LABEL: @n29( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG448:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META443:![0-9]+]], !DIExpression(), [[DBG448]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG449:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG450:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META444:![0-9]+]], !DIExpression(), [[DBG450]]) ; NOLZCNT-NEXT: call void @external_side_effect(), !dbg [[DBG451:![0-9]+]] ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG452:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META445:![0-9]+]], !DIExpression(), [[DBG452]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG453:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META446:![0-9]+]], !DIExpression(), [[DBG453]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG454:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META447:![0-9]+]], !DIExpression(), [[DBG454]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG455:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG450]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG456:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] call void @external_side_effect() ; not part of idiom. %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } define i32 @n30(i32 %x) { ; LZCNT-LABEL: @n30( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], -1, !dbg [[DBG462:![0-9]+]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG462]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG462]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG462]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 31, [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG462]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG462]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG462]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG462]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG463:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG462]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG462]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META459:![0-9]+]], !DIExpression(), [[DBG462]]) ; LZCNT-NEXT: call void @external_side_effect(), !dbg [[DBG464:![0-9]+]] ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp sgt i32 [[TMP0]], -1, !dbg [[DBG465:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META460:![0-9]+]], !DIExpression(), [[DBG465]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG466:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META461:![0-9]+]], !DIExpression(), [[DBG466]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG467:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG467]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG467]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG462]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG468:![0-9]+]] ; ; NOLZCNT-LABEL: @n30( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG462:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG463:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META459:![0-9]+]], !DIExpression(), [[DBG463]]) ; NOLZCNT-NEXT: call void @external_side_effect(), !dbg [[DBG464:![0-9]+]] ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp sgt i32 [[X_CURR]], -1, !dbg [[DBG465:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META460:![0-9]+]], !DIExpression(), [[DBG465]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG466:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META461:![0-9]+]], !DIExpression(), [[DBG466]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG467:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG463]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG468:![0-9]+]] ; entry: br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] call void @external_side_effect() ; not part of idiom. %x.curr.isbitunset = icmp sgt i32 %x.curr, -1 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; In-loop instructions should not have uses outside of the loop. define i32 @n31(i32 %x, i32 %bit) { ; LZCNT-LABEL: @n31( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG476:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META471:![0-9]+]], !DIExpression(), [[DBG476]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG477:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG477]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG477]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG477]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG477]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG477]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG477]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG477]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG477]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG477]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG478:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG477]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG477]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META472:![0-9]+]], !DIExpression(), [[DBG477]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG479:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META473:![0-9]+]], !DIExpression(), [[DBG479]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG480:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META474:![0-9]+]], !DIExpression(), [[DBG480]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG481:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META475:![0-9]+]], !DIExpression(), [[DBG481]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG482:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG482]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG482]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG477]] ; LZCNT-NEXT: [[X_CURR_BITMASKED_LCSSA:%.*]] = phi i32 [ [[X_CURR_BITMASKED]], [[LOOP]] ], !dbg [[DBG479]] ; LZCNT-NEXT: call void @use32(i32 [[X_CURR_BITMASKED_LCSSA]]), !dbg [[DBG483:![0-9]+]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG484:![0-9]+]] ; ; NOLZCNT-LABEL: @n31( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG476:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META471:![0-9]+]], !DIExpression(), [[DBG476]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG477:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG478:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META472:![0-9]+]], !DIExpression(), [[DBG478]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG479:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META473:![0-9]+]], !DIExpression(), [[DBG479]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG480:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META474:![0-9]+]], !DIExpression(), [[DBG480]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG481:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META475:![0-9]+]], !DIExpression(), [[DBG481]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG482:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG478]] ; NOLZCNT-NEXT: [[X_CURR_BITMASKED_LCSSA:%.*]] = phi i32 [ [[X_CURR_BITMASKED]], [[LOOP]] ], !dbg [[DBG479]] ; NOLZCNT-NEXT: call void @use32(i32 [[X_CURR_BITMASKED_LCSSA]]), !dbg [[DBG483:![0-9]+]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG484:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: call void @use32(i32 %x.curr.bitmasked) ret i32 %x.curr } define i32 @n32(i32 %x, i32 %bit) { ; LZCNT-LABEL: @n32( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i32 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT_FR]], !dbg [[DBG492:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META487:![0-9]+]], !DIExpression(), [[DBG492]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i32 [[BITMASK]], -1, !dbg [[DBG493:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i32 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG493]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i32 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG493]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i32 @llvm.ctlz.i32(i32 [[X_MASKED]], i1 true), !dbg [[DBG493]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i32 32, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG493]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i32 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG493]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i32 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG493]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i32 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG493]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i32 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG493]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG493]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG494:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG493]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG493]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP0]], [[META488:![0-9]+]], !DIExpression(), [[DBG493]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[TMP0]], [[BITMASK]], !dbg [[DBG495:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META489:![0-9]+]], !DIExpression(), [[DBG495]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG496:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META490:![0-9]+]], !DIExpression(), [[DBG496]]) ; LZCNT-NEXT: [[TMP1]] = shl i32 [[TMP0]], 1, !dbg [[DBG497:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i32 [[TMP1]], [[META491:![0-9]+]], !DIExpression(), [[DBG497]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i32 [[LOOP_IV]], 1, !dbg [[DBG498:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i32 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG498]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG498]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG493]] ; LZCNT-NEXT: [[X_CURR_ISBITUNSET_LCSSA:%.*]] = phi i1 [ [[X_CURR_ISBITUNSET]], [[LOOP]] ], !dbg [[DBG496]] ; LZCNT-NEXT: call void @use1(i1 [[X_CURR_ISBITUNSET_LCSSA]]), !dbg [[DBG499:![0-9]+]] ; LZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG500:![0-9]+]] ; ; NOLZCNT-LABEL: @n32( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG492:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[BITMASK]], [[META487:![0-9]+]], !DIExpression(), [[DBG492]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG493:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG494:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR]], [[META488:![0-9]+]], !DIExpression(), [[DBG494]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG495:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META489:![0-9]+]], !DIExpression(), [[DBG495]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG496:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META490:![0-9]+]], !DIExpression(), [[DBG496]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i32 [[X_CURR]], 1, !dbg [[DBG497:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i32 [[X_NEXT]], [[META491:![0-9]+]], !DIExpression(), [[DBG497]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG498:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i32 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG494]] ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET_LCSSA:%.*]] = phi i1 [ [[X_CURR_ISBITUNSET]], [[LOOP]] ], !dbg [[DBG496]] ; NOLZCNT-NEXT: call void @use1(i1 [[X_CURR_ISBITUNSET_LCSSA]]), !dbg [[DBG499:![0-9]+]] ; NOLZCNT-NEXT: ret i32 [[X_CURR_LCSSA]], !dbg [[DBG500:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr = phi i32 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: call void @use1(i1 %x.curr.isbitunset) ret i32 %x.curr } ; %x.curr is not a PHI node define i32 @n33(i32 %x, i32 %bit, i32 %x.curr) { ; ALL-LABEL: @n33( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG507:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META503:![0-9]+]], !DIExpression(), [[DBG507]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG508:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR:%.*]], [[BITMASK]], !dbg [[DBG509:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META504:![0-9]+]], !DIExpression(), [[DBG509]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG510:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META505:![0-9]+]], !DIExpression(), [[DBG510]]) ; ALL-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG511:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META506:![0-9]+]], !DIExpression(), [[DBG511]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG512:![0-9]+]] ; ALL: end: ; ALL-NEXT: ret i32 [[X_CURR]], !dbg [[DBG513:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br label %loop loop: %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; %x.curr is a PHI node in a wrong block define i32 @n34(i32 %bit, i1 %c, i32 %x0, i32 %x1) { ; ALL-LABEL: @n34( ; ALL-NEXT: entry: ; ALL-NEXT: [[BITMASK:%.*]] = shl i32 1, [[BIT:%.*]], !dbg [[DBG521:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[BITMASK]], [[META516:![0-9]+]], !DIExpression(), [[DBG521]]) ; ALL-NEXT: br i1 [[C:%.*]], label [[BB0:%.*]], label [[BB1:%.*]], !dbg [[DBG522:![0-9]+]] ; ALL: bb0: ; ALL-NEXT: br label [[MERGE:%.*]], !dbg [[DBG523:![0-9]+]] ; ALL: bb1: ; ALL-NEXT: br label [[MERGE]], !dbg [[DBG524:![0-9]+]] ; ALL: merge: ; ALL-NEXT: [[X_CURR:%.*]] = phi i32 [ [[X0:%.*]], [[BB0]] ], [ [[X1:%.*]], [[BB1]] ], !dbg [[DBG525:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR]], [[META517:![0-9]+]], !DIExpression(), [[DBG525]]) ; ALL-NEXT: br label [[LOOP:%.*]], !dbg [[DBG526:![0-9]+]] ; ALL: loop: ; ALL-NEXT: [[X_CURR_BITMASKED:%.*]] = and i32 [[X_CURR]], [[BITMASK]], !dbg [[DBG527:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_CURR_BITMASKED]], [[META518:![0-9]+]], !DIExpression(), [[DBG527]]) ; ALL-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i32 [[X_CURR_BITMASKED]], 0, !dbg [[DBG528:![0-9]+]] ; ALL-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META519:![0-9]+]], !DIExpression(), [[DBG528]]) ; ALL-NEXT: [[X_NEXT:%.*]] = shl i32 [[X_CURR]], 1, !dbg [[DBG529:![0-9]+]] ; ALL-NEXT: #dbg_value(i32 [[X_NEXT]], [[META520:![0-9]+]], !DIExpression(), [[DBG529]]) ; ALL-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG530:![0-9]+]] ; ALL: end: ; ALL-NEXT: ret i32 [[X_CURR]], !dbg [[DBG531:![0-9]+]] ; entry: %bitmask = shl i32 1, %bit br i1 %c, label %bb0, label %bb1 bb0: br label %merge bb1: br label %merge merge: %x.curr = phi i32 [ %x0, %bb0 ], [ %x1, %bb1 ] br label %loop loop: %x.curr.bitmasked = and i32 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i32 %x.curr.bitmasked, 0 %x.next = shl i32 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: ret i32 %x.curr } ; Various weird bit widths define void @t35_i1(i1 %x, i1 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @t35_i1( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i1 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i1 true, [[BIT_FR]], !dbg [[DBG539:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[BITMASK]], [[META534:![0-9]+]], !DIExpression(), [[DBG539]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i1 [[BITMASK]], true, !dbg [[DBG540:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i1 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG540]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i1 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG540]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i1 @llvm.ctlz.i1(i1 [[X_MASKED]], i1 true), !dbg [[DBG540]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i1 true, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG540]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add i1 [[X_MASKED_NUMACTIVEBITS]], true, !dbg [[DBG540]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i1 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG540]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i1 [[LOOP_BACKEDGETAKENCOUNT]], true, !dbg [[DBG540]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i1 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG540]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i1 [[X_CURR]], true, !dbg [[DBG540]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG541:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i1 [ false, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG540]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i1 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG540]] ; LZCNT-NEXT: #dbg_value(i1 [[TMP0]], [[META535:![0-9]+]], !DIExpression(), [[DBG540]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i1 [[TMP0]], [[BITMASK]], !dbg [[DBG542:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_BITMASKED]], [[META536:![0-9]+]], !DIExpression(), [[DBG542]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i1 [[X_CURR_BITMASKED]], false, !dbg [[DBG543:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META537:![0-9]+]], !DIExpression(), [[DBG543]]) ; LZCNT-NEXT: [[TMP1]] = shl i1 [[TMP0]], true, !dbg [[DBG544:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[TMP1]], [[META538:![0-9]+]], !DIExpression(), [[DBG544]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i1 [[LOOP_IV]], true, !dbg [[DBG545:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i1 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG545]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG545]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i1 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG540]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i1 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG544]] ; LZCNT-NEXT: store i1 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG546:![0-9]+]] ; LZCNT-NEXT: store i1 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG547:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG548:![0-9]+]] ; ; NOLZCNT-LABEL: @t35_i1( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i1 true, [[BIT:%.*]], !dbg [[DBG539:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[BITMASK]], [[META534:![0-9]+]], !DIExpression(), [[DBG539]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG540:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i1 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG541:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR]], [[META535:![0-9]+]], !DIExpression(), [[DBG541]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i1 [[X_CURR]], [[BITMASK]], !dbg [[DBG542:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_BITMASKED]], [[META536:![0-9]+]], !DIExpression(), [[DBG542]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i1 [[X_CURR_BITMASKED]], false, !dbg [[DBG543:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META537:![0-9]+]], !DIExpression(), [[DBG543]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i1 [[X_CURR]], true, !dbg [[DBG544:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_NEXT]], [[META538:![0-9]+]], !DIExpression(), [[DBG544]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG545:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i1 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG541]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i1 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG544]] ; NOLZCNT-NEXT: store i1 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG546:![0-9]+]] ; NOLZCNT-NEXT: store i1 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG547:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG548:![0-9]+]] ; entry: %bitmask = shl i1 1, %bit br label %loop loop: %x.curr = phi i1 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i1 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i1 %x.curr.bitmasked, 0 %x.next = shl i1 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i1 %x.curr, ptr %p0 store i1 %x.next, ptr %p1 ret void } define void @t36_i2(i2 %x, i2 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @t36_i2( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i2 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i2 1, [[BIT_FR]], !dbg [[DBG556:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i2 [[BITMASK]], [[META551:![0-9]+]], !DIExpression(), [[DBG556]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i2 [[BITMASK]], -1, !dbg [[DBG557:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i2 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG557]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i2 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG557]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i2 @llvm.ctlz.i2(i2 [[X_MASKED]], i1 true), !dbg [[DBG557]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw i2 -2, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG557]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add i2 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG557]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i2 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG557]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw i2 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG557]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i2 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG557]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i2 [[X_CURR]], 1, !dbg [[DBG557]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG558:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i2 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG557]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i2 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG557]] ; LZCNT-NEXT: #dbg_value(i2 [[TMP0]], [[META552:![0-9]+]], !DIExpression(), [[DBG557]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i2 [[TMP0]], [[BITMASK]], !dbg [[DBG559:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i2 [[X_CURR_BITMASKED]], [[META553:![0-9]+]], !DIExpression(), [[DBG559]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i2 [[X_CURR_BITMASKED]], 0, !dbg [[DBG560:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META554:![0-9]+]], !DIExpression(), [[DBG560]]) ; LZCNT-NEXT: [[TMP1]] = shl i2 [[TMP0]], 1, !dbg [[DBG561:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i2 [[TMP1]], [[META555:![0-9]+]], !DIExpression(), [[DBG561]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw i2 [[LOOP_IV]], 1, !dbg [[DBG562:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i2 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG562]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG562]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i2 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG557]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i2 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG561]] ; LZCNT-NEXT: store i2 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG563:![0-9]+]] ; LZCNT-NEXT: store i2 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG564:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG565:![0-9]+]] ; ; NOLZCNT-LABEL: @t36_i2( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i2 1, [[BIT:%.*]], !dbg [[DBG556:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i2 [[BITMASK]], [[META551:![0-9]+]], !DIExpression(), [[DBG556]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG557:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i2 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG558:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i2 [[X_CURR]], [[META552:![0-9]+]], !DIExpression(), [[DBG558]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i2 [[X_CURR]], [[BITMASK]], !dbg [[DBG559:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i2 [[X_CURR_BITMASKED]], [[META553:![0-9]+]], !DIExpression(), [[DBG559]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i2 [[X_CURR_BITMASKED]], 0, !dbg [[DBG560:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META554:![0-9]+]], !DIExpression(), [[DBG560]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i2 [[X_CURR]], 1, !dbg [[DBG561:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i2 [[X_NEXT]], [[META555:![0-9]+]], !DIExpression(), [[DBG561]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG562:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i2 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG558]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i2 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG561]] ; NOLZCNT-NEXT: store i2 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG563:![0-9]+]] ; NOLZCNT-NEXT: store i2 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG564:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG565:![0-9]+]] ; entry: %bitmask = shl i2 1, %bit br label %loop loop: %x.curr = phi i2 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i2 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i2 %x.curr.bitmasked, 0 %x.next = shl i2 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i2 %x.curr, ptr %p0 store i2 %x.next, ptr %p1 ret void } define void @t37_i3(i3 %x, i3 %bit, ptr %p0, ptr %p1) { ; LZCNT-LABEL: @t37_i3( ; LZCNT-NEXT: entry: ; LZCNT-NEXT: [[BIT_FR:%.*]] = freeze i3 [[BIT:%.*]] ; LZCNT-NEXT: [[BITMASK:%.*]] = shl i3 1, [[BIT_FR]], !dbg [[DBG573:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i3 [[BITMASK]], [[META568:![0-9]+]], !DIExpression(), [[DBG573]]) ; LZCNT-NEXT: [[BIT_FR_LOWBITMASK:%.*]] = add i3 [[BITMASK]], -1, !dbg [[DBG574:![0-9]+]] ; LZCNT-NEXT: [[BIT_FR_MASK:%.*]] = or i3 [[BIT_FR_LOWBITMASK]], [[BITMASK]], !dbg [[DBG574]] ; LZCNT-NEXT: [[X_MASKED:%.*]] = and i3 [[X:%.*]], [[BIT_FR_MASK]], !dbg [[DBG574]] ; LZCNT-NEXT: [[X_MASKED_NUMLEADINGZEROS:%.*]] = call i3 @llvm.ctlz.i3(i3 [[X_MASKED]], i1 true), !dbg [[DBG574]] ; LZCNT-NEXT: [[X_MASKED_NUMACTIVEBITS:%.*]] = sub nuw nsw i3 3, [[X_MASKED_NUMLEADINGZEROS]], !dbg [[DBG574]] ; LZCNT-NEXT: [[X_MASKED_LEADINGONEPOS:%.*]] = add nsw i3 [[X_MASKED_NUMACTIVEBITS]], -1, !dbg [[DBG574]] ; LZCNT-NEXT: [[LOOP_BACKEDGETAKENCOUNT:%.*]] = sub nuw nsw i3 [[BIT_FR]], [[X_MASKED_LEADINGONEPOS]], !dbg [[DBG574]] ; LZCNT-NEXT: [[LOOP_TRIPCOUNT:%.*]] = add nuw nsw i3 [[LOOP_BACKEDGETAKENCOUNT]], 1, !dbg [[DBG574]] ; LZCNT-NEXT: [[X_CURR:%.*]] = shl i3 [[X]], [[LOOP_BACKEDGETAKENCOUNT]], !dbg [[DBG574]] ; LZCNT-NEXT: [[X_NEXT:%.*]] = shl i3 [[X_CURR]], 1, !dbg [[DBG574]] ; LZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG575:![0-9]+]] ; LZCNT: loop: ; LZCNT-NEXT: [[LOOP_IV:%.*]] = phi i3 [ 0, [[ENTRY:%.*]] ], [ [[LOOP_IV_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG574]] ; LZCNT-NEXT: [[TMP0:%.*]] = phi i3 [ [[X]], [[ENTRY]] ], [ [[TMP1:%.*]], [[LOOP]] ], !dbg [[DBG574]] ; LZCNT-NEXT: #dbg_value(i3 [[TMP0]], [[META569:![0-9]+]], !DIExpression(), [[DBG574]]) ; LZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i3 [[TMP0]], [[BITMASK]], !dbg [[DBG576:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i3 [[X_CURR_BITMASKED]], [[META570:![0-9]+]], !DIExpression(), [[DBG576]]) ; LZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i3 [[X_CURR_BITMASKED]], 0, !dbg [[DBG577:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META571:![0-9]+]], !DIExpression(), [[DBG577]]) ; LZCNT-NEXT: [[TMP1]] = shl i3 [[TMP0]], 1, !dbg [[DBG578:![0-9]+]] ; LZCNT-NEXT: #dbg_value(i3 [[TMP1]], [[META572:![0-9]+]], !DIExpression(), [[DBG578]]) ; LZCNT-NEXT: [[LOOP_IV_NEXT]] = add nuw nsw i3 [[LOOP_IV]], 1, !dbg [[DBG579:![0-9]+]] ; LZCNT-NEXT: [[LOOP_IVCHECK:%.*]] = icmp eq i3 [[LOOP_IV_NEXT]], [[LOOP_TRIPCOUNT]], !dbg [[DBG579]] ; LZCNT-NEXT: br i1 [[LOOP_IVCHECK]], label [[END:%.*]], label [[LOOP]], !dbg [[DBG579]] ; LZCNT: end: ; LZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i3 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG574]] ; LZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i3 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG578]] ; LZCNT-NEXT: store i3 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG580:![0-9]+]] ; LZCNT-NEXT: store i3 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG581:![0-9]+]] ; LZCNT-NEXT: ret void, !dbg [[DBG582:![0-9]+]] ; ; NOLZCNT-LABEL: @t37_i3( ; NOLZCNT-NEXT: entry: ; NOLZCNT-NEXT: [[BITMASK:%.*]] = shl i3 1, [[BIT:%.*]], !dbg [[DBG573:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i3 [[BITMASK]], [[META568:![0-9]+]], !DIExpression(), [[DBG573]]) ; NOLZCNT-NEXT: br label [[LOOP:%.*]], !dbg [[DBG574:![0-9]+]] ; NOLZCNT: loop: ; NOLZCNT-NEXT: [[X_CURR:%.*]] = phi i3 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[X_NEXT:%.*]], [[LOOP]] ], !dbg [[DBG575:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i3 [[X_CURR]], [[META569:![0-9]+]], !DIExpression(), [[DBG575]]) ; NOLZCNT-NEXT: [[X_CURR_BITMASKED:%.*]] = and i3 [[X_CURR]], [[BITMASK]], !dbg [[DBG576:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i3 [[X_CURR_BITMASKED]], [[META570:![0-9]+]], !DIExpression(), [[DBG576]]) ; NOLZCNT-NEXT: [[X_CURR_ISBITUNSET:%.*]] = icmp eq i3 [[X_CURR_BITMASKED]], 0, !dbg [[DBG577:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i1 [[X_CURR_ISBITUNSET]], [[META571:![0-9]+]], !DIExpression(), [[DBG577]]) ; NOLZCNT-NEXT: [[X_NEXT]] = shl i3 [[X_CURR]], 1, !dbg [[DBG578:![0-9]+]] ; NOLZCNT-NEXT: #dbg_value(i3 [[X_NEXT]], [[META572:![0-9]+]], !DIExpression(), [[DBG578]]) ; NOLZCNT-NEXT: br i1 [[X_CURR_ISBITUNSET]], label [[LOOP]], label [[END:%.*]], !dbg [[DBG579:![0-9]+]] ; NOLZCNT: end: ; NOLZCNT-NEXT: [[X_CURR_LCSSA:%.*]] = phi i3 [ [[X_CURR]], [[LOOP]] ], !dbg [[DBG575]] ; NOLZCNT-NEXT: [[X_NEXT_LCSSA:%.*]] = phi i3 [ [[X_NEXT]], [[LOOP]] ], !dbg [[DBG578]] ; NOLZCNT-NEXT: store i3 [[X_CURR_LCSSA]], ptr [[P0:%.*]], align 1, !dbg [[DBG580:![0-9]+]] ; NOLZCNT-NEXT: store i3 [[X_NEXT_LCSSA]], ptr [[P1:%.*]], align 1, !dbg [[DBG581:![0-9]+]] ; NOLZCNT-NEXT: ret void, !dbg [[DBG582:![0-9]+]] ; entry: %bitmask = shl i3 1, %bit br label %loop loop: %x.curr = phi i3 [ %x, %entry ], [ %x.next, %loop ] %x.curr.bitmasked = and i3 %x.curr, %bitmask %x.curr.isbitunset = icmp eq i3 %x.curr.bitmasked, 0 %x.next = shl i3 %x.curr, 1 br i1 %x.curr.isbitunset, label %loop, label %end end: store i3 %x.curr, ptr %p0 store i3 %x.next, ptr %p1 ret void }