derek.holloway
7502bf64a4
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45 lines
1.4 KiB
LLVM
45 lines
1.4 KiB
LLVM
; RUN: opt < %s -passes=lint -disable-output 2>&1 | FileCheck %s
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%s = type { i8 }
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memcpy.p0.p0.i32(ptr nocapture writeonly, ptr nocapture readonly, i32, i1) #0
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; Function Attrs: argmemonly nounwind
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declare void @llvm.memset.p0.i32(ptr nocapture writeonly, i8, i32, i1) #0
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declare void @f1(ptr noalias nocapture sret(%s), ptr nocapture)
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define void @f2() {
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entry:
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%c = alloca %s
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%tmp = alloca %s
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call void @llvm.memset.p0.i32(ptr %c, i8 0, i32 1, i1 false)
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call void @f1(ptr sret(%s) %c, ptr %c)
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ret void
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}
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; Lint should complain about us passing %c to both arguments since one of them
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; is noalias.
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; CHECK: Unusual: noalias argument aliases another argument
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; CHECK-NEXT: call void @f1(ptr sret(%s) %c, ptr %c)
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declare void @f3(ptr noalias nocapture sret(%s), ptr byval(%s) nocapture readnone)
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define void @f4() {
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entry:
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%c = alloca %s
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%tmp = alloca %s
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call void @llvm.memset.p0.i32(ptr %c, i8 0, i32 1, i1 false)
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call void @f3(ptr sret(%s) %c, ptr byval(%s) %c)
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ret void
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}
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; Lint should not complain about passing %c to both arguments even if one is
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; noalias, since the other one is byval, effectively copying the data to the
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; stack instead of passing the pointer itself.
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; CHECK-NOT: Unusual: noalias argument aliases another argument
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; CHECK-NOT: call void @f3(ptr sret(%s) %c, ptr byval(%s) %c)
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attributes #0 = { argmemonly nounwind }
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