derek.holloway
7502bf64a4
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60 lines
2.3 KiB
LLVM
60 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -S -passes=loop-idiom < %s | FileCheck %s
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; The poison flags should be preserved, as no transform takes place.
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define void @test(ptr %p.end, ptr %p.start) {
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; CHECK-LABEL: define void @test(
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; CHECK-SAME: ptr [[P_END:%.*]], ptr [[P_START:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[P_END_INT:%.*]] = ptrtoint ptr [[P_END]] to i64
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; CHECK-NEXT: [[P_START_INT:%.*]] = ptrtoint ptr [[P_START]] to i64
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; CHECK-NEXT: [[DIST:%.*]] = sub nuw i64 [[P_END_INT]], [[P_START_INT]]
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; CHECK-NEXT: [[LEN:%.*]] = lshr exact i64 [[DIST]], 5
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq ptr [[P_END]], [[P_START]]
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; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[PREHEADER:%.*]]
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; CHECK: preheader:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[LEN]], [[PREHEADER]] ], [ [[IV_DEC:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[IV_NEG:%.*]] = sub nsw i64 0, [[IV]]
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; CHECK-NEXT: [[SRC:%.*]] = getelementptr inbounds [32 x i8], ptr [[P_END]], i64 [[IV_NEG]]
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; CHECK-NEXT: [[V:%.*]] = load <4 x i64>, ptr [[SRC]], align 8
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; CHECK-NEXT: [[DST:%.*]] = getelementptr inbounds [32 x i8], ptr [[P_START]], i64 [[IV_NEG]]
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; CHECK-NEXT: store <4 x i64> [[V]], ptr [[DST]], align 8
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; CHECK-NEXT: [[IV_DEC]] = add i64 [[IV]], -1
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i64 [[IV_DEC]], 0
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; CHECK-NEXT: br i1 [[CMP2]], label [[LOOP_EXIT:%.*]], label [[LOOP]]
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; CHECK: loop.exit:
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; CHECK-NEXT: br label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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%p.end.int = ptrtoint ptr %p.end to i64
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%p.start.int = ptrtoint ptr %p.start to i64
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%dist = sub nuw i64 %p.end.int, %p.start.int
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%len = lshr exact i64 %dist, 5
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%cmp = icmp eq ptr %p.end, %p.start
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br i1 %cmp, label %exit, label %preheader
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preheader:
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br label %loop
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loop:
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%iv = phi i64 [ %len, %preheader ], [ %iv.dec, %loop ]
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%iv.neg = sub nsw i64 0, %iv
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%src = getelementptr inbounds [32 x i8], ptr %p.end, i64 %iv.neg
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%v = load <4 x i64>, ptr %src, align 8
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%dst = getelementptr inbounds [32 x i8], ptr %p.start, i64 %iv.neg
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store <4 x i64> %v, ptr %dst, align 8
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%iv.dec = add i64 %iv, -1
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%cmp2 = icmp eq i64 %iv.dec, 0
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br i1 %cmp2, label %loop.exit, label %loop
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loop.exit:
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br label %exit
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exit:
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ret void
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}
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