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| author | Duncan Sands <baldrick@free.fr> | 2009-03-02 09:18:21 +0000 |
|---|---|---|
| committer | Duncan Sands <baldrick@free.fr> | 2009-03-02 09:18:21 +0000 |
| commit | 5795a6091df9cd110824f4bc89ebda78bebfbe8a (patch) | |
| tree | 24bedc1bb7782fad211b2cc64e3ff95760895d8c /llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll | |
| parent | 7cff81825ffde01c2085cebca463fd837c0b4775 (diff) | |
| download | bcm5719-llvm-5795a6091df9cd110824f4bc89ebda78bebfbe8a.tar.gz bcm5719-llvm-5795a6091df9cd110824f4bc89ebda78bebfbe8a.zip | |
Fix PR3694: add an instcombine micro-optimization that helps
clean up when using variable length arrays in llvm-gcc.
llvm-svn: 65832
Diffstat (limited to 'llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll')
| -rw-r--r-- | llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll b/llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll new file mode 100644 index 00000000000..1e136f5eab3 --- /dev/null +++ b/llvm/test/Transforms/InstCombine/2009-03-02-VarLengthArrayGEP.ll @@ -0,0 +1,14 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {getelementptr i32} +; PR3694 + +define i32 @e(i32 %m, i32 %n) nounwind { +entry: + %0 = alloca i32, i32 %n, align 4 ; <i32*> [#uses=2] + %1 = bitcast i32* %0 to [0 x i32]* ; <[0 x i32]*> [#uses=1] + call void @f(i32* %0) nounwind + %2 = getelementptr [0 x i32]* %1, i32 0, i32 %m ; <i32*> [#uses=1] + %3 = load i32* %2, align 4 ; <i32> [#uses=1] + ret i32 %3 +} + +declare void @f(i32*) |
