derek.holloway
7502bf64a4
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54 lines
2.3 KiB
LLVM
54 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=loop-idiom -mtriple=x86_64 -mcpu=corei7 < %s -S | FileCheck %s
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declare void @escape_inner(i8, i8, i8, i1, i8)
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declare void @escape_outer(i8, i8, i8, i1, i8)
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; On corei7, lzcount is not cheap, so we don't transform.
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define i8 @n(i8 %val, i8 %start, i8 %extraoffset) {
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; CHECK-LABEL: @n(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i8 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ]
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; CHECK-NEXT: [[NBITS:%.*]] = add nsw i8 [[IV]], [[EXTRAOFFSET:%.*]]
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; CHECK-NEXT: [[VAL_SHIFTED:%.*]] = lshr i8 [[VAL:%.*]], [[NBITS]]
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; CHECK-NEXT: [[VAL_SHIFTED_ISZERO:%.*]] = icmp eq i8 [[VAL_SHIFTED]], 0
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; CHECK-NEXT: [[IV_NEXT]] = add i8 [[IV]], 1
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; CHECK-NEXT: call void @escape_inner(i8 [[IV]], i8 [[NBITS]], i8 [[VAL_SHIFTED]], i1 [[VAL_SHIFTED_ISZERO]], i8 [[IV_NEXT]])
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; CHECK-NEXT: br i1 [[VAL_SHIFTED_ISZERO]], label [[END:%.*]], label [[LOOP]]
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; CHECK: end:
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; CHECK-NEXT: [[IV_RES:%.*]] = phi i8 [ [[IV]], [[LOOP]] ]
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; CHECK-NEXT: [[NBITS_RES:%.*]] = phi i8 [ [[NBITS]], [[LOOP]] ]
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; CHECK-NEXT: [[VAL_SHIFTED_RES:%.*]] = phi i8 [ [[VAL_SHIFTED]], [[LOOP]] ]
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; CHECK-NEXT: [[VAL_SHIFTED_ISZERO_RES:%.*]] = phi i1 [ [[VAL_SHIFTED_ISZERO]], [[LOOP]] ]
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; CHECK-NEXT: [[IV_NEXT_RES:%.*]] = phi i8 [ [[IV_NEXT]], [[LOOP]] ]
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; CHECK-NEXT: call void @escape_outer(i8 [[IV_RES]], i8 [[NBITS_RES]], i8 [[VAL_SHIFTED_RES]], i1 [[VAL_SHIFTED_ISZERO_RES]], i8 [[IV_NEXT_RES]])
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; CHECK-NEXT: ret i8 [[IV_RES]]
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;
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entry:
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br label %loop
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loop:
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%iv = phi i8 [ %start, %entry ], [ %iv.next, %loop ]
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%nbits = add nsw i8 %iv, %extraoffset
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%val.shifted = lshr i8 %val, %nbits
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%val.shifted.iszero = icmp eq i8 %val.shifted, 0
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%iv.next = add i8 %iv, 1
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call void @escape_inner(i8 %iv, i8 %nbits, i8 %val.shifted, i1 %val.shifted.iszero, i8 %iv.next)
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br i1 %val.shifted.iszero, label %end, label %loop
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end:
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%iv.res = phi i8 [ %iv, %loop ]
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%nbits.res = phi i8 [ %nbits, %loop ]
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%val.shifted.res = phi i8 [ %val.shifted, %loop ]
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%val.shifted.iszero.res = phi i1 [ %val.shifted.iszero, %loop ]
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%iv.next.res = phi i8 [ %iv.next, %loop ]
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call void @escape_outer(i8 %iv.res, i8 %nbits.res, i8 %val.shifted.res, i1 %val.shifted.iszero.res, i8 %iv.next.res)
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ret i8 %iv.res
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}
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