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| author | Nick Lewycky <nicholas@mxc.ca> | 2014-03-26 23:45:15 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2014-03-26 23:45:15 +0000 |
| commit | 77d5fb40c8f71a5bef45e7ad8aeb8a444a6e3df4 (patch) | |
| tree | 56566888a6737d8ba814daad1bd54f0da687d0a9 /llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll | |
| parent | 7790cf88e0119f3c16062700587d9589c57f10a1 (diff) | |
| download | bcm5719-llvm-77d5fb40c8f71a5bef45e7ad8aeb8a444a6e3df4.tar.gz bcm5719-llvm-77d5fb40c8f71a5bef45e7ad8aeb8a444a6e3df4.zip | |
Treat lifetime.start'd memory like we treat freshly alloca'd memory. Patch by Björn Steinbrink!
llvm-svn: 204876
Diffstat (limited to 'llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll')
| -rw-r--r-- | llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll b/llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll index fd4965f4dc5..663b8dcfd3d 100644 --- a/llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll +++ b/llvm/test/Transforms/MemCpyOpt/memcpy-undef.ll @@ -21,5 +21,26 @@ define i32 @test1(%struct.foo* nocapture %foobie) nounwind noinline ssp uwtable ; CHECK-NOT: call void @llvm.memcpy } +define void @test2(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable { + call void @llvm.lifetime.start(i64 8, i8* %in) + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out, i8* %in, i64 8, i32 1, i1 false) + ret void + +; Check that the memcpy is removed. +; CHECK-LABEL: @test2( +; CHECK-NOT: call void @llvm.memcpy +} + +define void @test3(i8* sret noalias nocapture %out, i8* %in) nounwind noinline ssp uwtable { + call void @llvm.lifetime.start(i64 4, i8* %in) + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out, i8* %in, i64 8, i32 1, i1 false) + ret void + +; Check that the memcpy is not removed. +; CHECK-LABEL: @test3( +; CHECK: call void @llvm.memcpy +} + declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind +declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind |
