diff options
| author | Bill Wendling <isanbard@gmail.com> | 2011-03-26 01:20:37 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2011-03-26 01:20:37 +0000 |
| commit | e420449e80191051d6d1636883f2400cb0a8ace5 (patch) | |
| tree | b88de841c67f1964b5b0a441ee3ef326e9aa83a2 /test/Transforms/DeadStoreElimination | |
| parent | 17cbaa3c82f5982c7ee3089f95529af1afd407d3 (diff) | |
| download | external_llvm-e420449e80191051d6d1636883f2400cb0a8ace5.zip external_llvm-e420449e80191051d6d1636883f2400cb0a8ace5.tar.gz external_llvm-e420449e80191051d6d1636883f2400cb0a8ace5.tar.bz2 | |
PR9561: A store with a negative offset (via GEP) could erroniously say that it
completely overlaps a previous store, thus mistakenly deleting that store. Check
for this condition.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128319 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/DeadStoreElimination')
| -rw-r--r-- | test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll b/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll new file mode 100644 index 0000000..e268dd5 --- /dev/null +++ b/test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll @@ -0,0 +1,22 @@ +; RUN: opt < %s -basicaa -dse -S | FileCheck %s +; PR9561 +target triple = "i386-apple-darwin9.8" + +@A = external global [0 x i32] + +declare cc10 void @Func2(i32*, i32*, i32*, i32) + +define cc10 void @Func1(i32* noalias %Arg1, i32* noalias %Arg2, i32* %Arg3, i32 %Arg4) { +entry: + store i32 add (i32 ptrtoint ([0 x i32]* @A to i32), i32 1), i32* %Arg2 +; CHECK: store i32 add (i32 ptrtoint ([0 x i32]* @A to i32), i32 1), i32* %Arg2 + %ln2gz = getelementptr i32* %Arg1, i32 14 + %ln2gA = bitcast i32* %ln2gz to double* + %ln2gB = load double* %ln2gA + %ln2gD = getelementptr i32* %Arg2, i32 -3 + %ln2gE = bitcast i32* %ln2gD to double* + store double %ln2gB, double* %ln2gE +; CHECK: store double %ln2gB, double* %ln2gE + tail call cc10 void @Func2(i32* %Arg1, i32* %Arg2, i32* %Arg3, i32 %Arg4) nounwind + ret void +} |