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5f651d5aba
Summary: If two arguments are both readonly, then they have no memory dependency that would violate noalias, even if they do actually overlap. Reviewers: hfinkel, efriedma Reviewed By: efriedma Subscribers: efriedma, hiraditya, llvm-commits, tstellar Tags: #llvm Differential Revision: https://reviews.llvm.org/D60239 llvm-svn: 359047
41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; RUN: opt < %s -lint -disable-output 2>&1 | FileCheck %s
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declare void @f1(i8* noalias readonly, i8*)
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define void @f2(i8* %a) {
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entry:
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call void @f1(i8* %a, i8* %a)
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ret void
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}
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; Lint should complain about us passing %a to both arguments, since the noalias
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; argument may depend on writes to the other.
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; CHECK: Unusual: noalias argument aliases another argument
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; CHECK-NEXT: call void @f1(i8* %a, i8* %a)
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declare void @f3(i8* noalias, i8* readonly)
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define void @f4(i8* %a) {
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entry:
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call void @f3(i8* %a, i8* %a)
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ret void
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}
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; Lint should complain about us passing %a to both arguments, since writes to
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; the noalias argument may cause a dependency for the other.
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; CHECK: Unusual: noalias argument aliases another argument
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; CHECK-NEXT: call void @f3(i8* %a, i8* %a)
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declare void @f5(i8* noalias readonly, i8* readonly)
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define void @f6(i8* %a) {
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entry:
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call void @f5(i8* %a, i8* %a)
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ret void
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}
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; Lint should not complain about passing %a to both arguments even if one is
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; noalias, since they are both readonly and thus have no dependence.
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; CHECK-NOT: Unusual: noalias argument aliases another argument
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; CHECK-NOT: call void @f5(i8* %a, i8* %a)
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