aad1a6f0a4
Summary: The original intent of test/Transforms/InstCombine/memset.ll was to test for lowering of llvm.memset into stores when the size of the memset is 1, 2, 4, or 8. Sometime between then and now the test has stopped testing for that, but remained passing due to testing for the absence of llvm.memset calls rather than the presence of store instructions. Right now this test ends up with an empty function body because the alloca is eliminated as safe-to-remove, which results in the llvm.memset calls's being eliminated due to their pointer args being undef; so it is not testing for conversion of llvm.memset into store instructions at all. This change alters the test to verify that store instructions are created, and moves the target of the memset to an arg of the proc to avoid it being eliminated as unused. Reviewers: anna, efriedma Reviewed By: efriedma Subscribers: efriedma, llvm-commits Differential Revision: https://reviews.llvm.org/D34642 llvm-svn: 306681
24 lines
1.2 KiB
LLVM
24 lines
1.2 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test([1024 x i8]* %target) {
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;; CHECK-LABEL: test
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;; CHECK-NEXT: [[P1:%[^\s]+]] = getelementptr inbounds [1024 x i8], [1024 x i8]* %target, i64 0, i64 0
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;; CHECK-NEXT: store i8 1, i8* [[P1]], align 1
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;; CHECK-NEXT: [[P2:%[^\s]+]] = bitcast [1024 x i8]* %target to i16*
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;; CHECK-NEXT: store i16 257, i16* [[P2]], align 2
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;; CHECK-NEXT: [[P3:%[^\s]+]] = bitcast [1024 x i8]* %target to i32*
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;; CHECK-NEXT: store i32 16843009, i32* [[P3]], align 4
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;; CHECK-NEXT: [[P4:%[^\s]+]] = bitcast [1024 x i8]* %target to i64*
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;; CHECK-NEXT: store i64 72340172838076673, i64* [[P4]], align 8
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;; CHECK-NEXT: ret i32 0
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%target_p = getelementptr [1024 x i8], [1024 x i8]* %target, i32 0, i32 0
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call void @llvm.memset.p0i8.i32(i8* %target_p, i8 1, i32 0, i32 1, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %target_p, i8 1, i32 1, i32 1, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %target_p, i8 1, i32 2, i32 2, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %target_p, i8 1, i32 4, i32 4, i1 false)
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call void @llvm.memset.p0i8.i32(i8* %target_p, i8 1, i32 8, i32 8, i1 false)
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ret i32 0
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}
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declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i32, i1) argmemonly nounwind
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