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| author | Chad Rosier <mcrosier@apple.com> | 2012-05-14 20:35:04 +0000 |
|---|---|---|
| committer | Chad Rosier <mcrosier@apple.com> | 2012-05-14 20:35:04 +0000 |
| commit | 3a884f5c17ac32e34e7e62b4602a0d73eeda1ce8 (patch) | |
| tree | 43d6a1b9b7b981588849d32a247a5e903ea97dad /test/Transforms/MemCpyOpt | |
| parent | 5262abb2682a4d09cda3563a55f27caffb57466c (diff) | |
| download | llvm-3a884f5c17ac32e34e7e62b4602a0d73eeda1ce8.tar.gz llvm-3a884f5c17ac32e34e7e62b4602a0d73eeda1ce8.tar.bz2 llvm-3a884f5c17ac32e34e7e62b4602a0d73eeda1ce8.tar.xz | |
Move the capture analysis from MemoryDependencyAnalysis to a more general place
so that it can be reused in MemCpyOptimizer. This analysis is needed to remove
an unnecessary memcpy when returning a struct into a local variable.
rdar://11341081
PR12686
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156776 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/MemCpyOpt')
| -rw-r--r-- | test/Transforms/MemCpyOpt/memcpy.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/test/Transforms/MemCpyOpt/memcpy.ll b/test/Transforms/MemCpyOpt/memcpy.ll index 63d0ebf5c1..3fa16288c2 100644 --- a/test/Transforms/MemCpyOpt/memcpy.ll +++ b/test/Transforms/MemCpyOpt/memcpy.ll @@ -148,3 +148,25 @@ define void @test8() { } declare noalias i8* @malloc(i32) + +; rdar://11341081 +%struct.big = type { [50 x i32] } + +define void @test9() nounwind uwtable ssp { +entry: +; CHECK: test9 +; CHECK: f1 +; CHECK-NOT: memcpy +; CHECK: f2 + %b = alloca %struct.big, align 4 + %tmp = alloca %struct.big, align 4 + call void @f1(%struct.big* sret %tmp) + %0 = bitcast %struct.big* %b to i8* + %1 = bitcast %struct.big* %tmp to i8* + call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 200, i32 4, i1 false) + call void @f2(%struct.big* %b) + ret void +} + +declare void @f1(%struct.big* sret) +declare void @f2(%struct.big*) |