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author | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
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committer | Shih-wei Liao <sliao@google.com> | 2010-02-10 11:10:31 -0800 |
commit | e264f62ca09a8f65c87a46d562a4d0f9ec5d457e (patch) | |
tree | 59e3d57ef656cef79afa708ae0a3daf25cd91fcf /test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll | |
download | external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.zip external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.gz external_llvm-e264f62ca09a8f65c87a46d562a4d0f9ec5d457e.tar.bz2 |
Check in LLVM r95781.
Diffstat (limited to 'test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll')
-rw-r--r-- | test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll b/test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll new file mode 100644 index 0000000..7435596 --- /dev/null +++ b/test/Transforms/Mem2Reg/2005-06-30-ReadBeforeWrite.ll @@ -0,0 +1,47 @@ +; RUN: opt < %s -mem2reg -instcombine -S | grep store +; PR590 + + +define void @zero(i8* %p, i32 %n) { +entry: + %p_addr = alloca i8* ; <i8**> [#uses=2] + %n_addr = alloca i32 ; <i32*> [#uses=2] + %i = alloca i32 ; <i32*> [#uses=6] + %out = alloca i32 ; <i32*> [#uses=2] + %undef = alloca i32 ; <i32*> [#uses=2] + store i8* %p, i8** %p_addr + store i32 %n, i32* %n_addr + store i32 0, i32* %i + br label %loopentry +loopentry: ; preds = %endif, %entry + %tmp.0 = load i32* %n_addr ; <i32> [#uses=1] + %tmp.1 = add i32 %tmp.0, 1 ; <i32> [#uses=1] + %tmp.2 = load i32* %i ; <i32> [#uses=1] + %tmp.3 = icmp sgt i32 %tmp.1, %tmp.2 ; <i1> [#uses=2] + %tmp.4 = zext i1 %tmp.3 to i32 ; <i32> [#uses=0] + br i1 %tmp.3, label %no_exit, label %return +no_exit: ; preds = %loopentry + %tmp.5 = load i32* %undef ; <i32> [#uses=1] + store i32 %tmp.5, i32* %out + store i32 0, i32* %undef + %tmp.6 = load i32* %i ; <i32> [#uses=1] + %tmp.7 = icmp sgt i32 %tmp.6, 0 ; <i1> [#uses=2] + %tmp.8 = zext i1 %tmp.7 to i32 ; <i32> [#uses=0] + br i1 %tmp.7, label %then, label %endif +then: ; preds = %no_exit + %tmp.9 = load i8** %p_addr ; <i8*> [#uses=1] + %tmp.10 = load i32* %i ; <i32> [#uses=1] + %tmp.11 = sub i32 %tmp.10, 1 ; <i32> [#uses=1] + %tmp.12 = getelementptr i8* %tmp.9, i32 %tmp.11 ; <i8*> [#uses=1] + %tmp.13 = load i32* %out ; <i32> [#uses=1] + %tmp.14 = trunc i32 %tmp.13 to i8 ; <i8> [#uses=1] + store i8 %tmp.14, i8* %tmp.12 + br label %endif +endif: ; preds = %then, %no_exit + %tmp.15 = load i32* %i ; <i32> [#uses=1] + %inc = add i32 %tmp.15, 1 ; <i32> [#uses=1] + store i32 %inc, i32* %i + br label %loopentry +return: ; preds = %loopentry + ret void +} |