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| author | Chris Lattner <sabre@nondot.org> | 2009-05-25 21:28:56 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-05-25 21:28:56 +0000 |
| commit | b2bc0522ff2b94d2ce8db786ac14380b6f47f509 (patch) | |
| tree | c7b762f1037e2fe2aa6e9013a856e17a132af08b /test/Transforms/GVN | |
| parent | 47d9c2980308284c87c2a3425ea45a7e50fedc23 (diff) | |
| download | external_llvm-b2bc0522ff2b94d2ce8db786ac14380b6f47f509.zip external_llvm-b2bc0522ff2b94d2ce8db786ac14380b6f47f509.tar.gz external_llvm-b2bc0522ff2b94d2ce8db786ac14380b6f47f509.tar.bz2 | |
make memdep use the getModRefInfo method for stores instead of the
low-level alias() method, allowing it to reason more aggressively
about pointers into constant memory. PR4189
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72403 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/GVN')
| -rw-r--r-- | test/Transforms/GVN/load-constant-mem.ll | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/test/Transforms/GVN/load-constant-mem.ll b/test/Transforms/GVN/load-constant-mem.ll new file mode 100644 index 0000000..83b9d38 --- /dev/null +++ b/test/Transforms/GVN/load-constant-mem.ll @@ -0,0 +1,13 @@ +; RUN: llvm-as < %s | opt -gvn -instcombine | llvm-dis | grep {ret i32 0} +; PR4189 +@G = external constant [4 x i32] + +define i32 @test(i8* %p, i32 %i) nounwind { +entry: + %P = getelementptr [4 x i32]* @G, i32 0, i32 %i + %A = load i32* %P + store i8 4, i8* %p + %B = load i32* %P + %C = sub i32 %A, %B + ret i32 %C +} |