4b96935bd7
Also, produce the canonical IR abs (s<0) to be more efficient. This is the libcall equivalent of the clang builtin change from: rL333038 Pasting from that commit message: The stdlib functions are defined in section 7.20.6.1 of the C standard with: "If the result cannot be represented, the behavior is undefined." That lets us mark the negation with 'nsw' because "sub i32 0, INT_MIN" would be UB/poison. llvm-svn: 333042
54 lines
1.7 KiB
LLVM
54 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; Verify that the non-default calling conv doesn't prevent the libcall simplification
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@.str = private unnamed_addr constant [4 x i8] c"abc\00", align 1
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define arm_aapcscc i32 @_abs(i32 %i) nounwind readnone {
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; CHECK-LABEL: @_abs(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 [[I:%.*]], 0
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; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[I]]
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[NEG]], i32 [[I]]
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; CHECK-NEXT: ret i32 [[TMP2]]
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;
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%call = tail call arm_aapcscc i32 @abs(i32 %i) nounwind readnone
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ret i32 %call
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}
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declare arm_aapcscc i32 @abs(i32) nounwind readnone
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define arm_aapcscc i32 @_labs(i32 %i) nounwind readnone {
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; CHECK-LABEL: @_labs(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 [[I:%.*]], 0
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; CHECK-NEXT: [[NEG:%.*]] = sub nsw i32 0, [[I]]
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; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 [[NEG]], i32 [[I]]
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; CHECK-NEXT: ret i32 [[TMP2]]
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;
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%call = tail call arm_aapcscc i32 @labs(i32 %i) nounwind readnone
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ret i32 %call
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}
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declare arm_aapcscc i32 @labs(i32) nounwind readnone
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define arm_aapcscc i32 @_strlen1() {
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; CHECK-LABEL: @_strlen1(
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; CHECK-NEXT: ret i32 3
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;
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%call = tail call arm_aapcscc i32 @strlen(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0))
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ret i32 %call
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}
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declare arm_aapcscc i32 @strlen(i8*)
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define arm_aapcscc zeroext i1 @_strlen2(i8* %str) {
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; CHECK-LABEL: @_strlen2(
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; CHECK-NEXT: [[STRLENFIRST:%.*]] = load i8, i8* [[STR:%.*]], align 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp ne i8 [[STRLENFIRST]], 0
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; CHECK-NEXT: ret i1 [[CMP]]
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;
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%call = tail call arm_aapcscc i32 @strlen(i8* %str)
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%cmp = icmp ne i32 %call, 0
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ret i1 %cmp
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}
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