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authorBill Wendling <isanbard@gmail.com>2011-03-26 01:20:37 +0000
committerBill Wendling <isanbard@gmail.com>2011-03-26 01:20:37 +0000
commite420449e80191051d6d1636883f2400cb0a8ace5 (patch)
treeb88de841c67f1964b5b0a441ee3ef326e9aa83a2 /test/Transforms
parent17cbaa3c82f5982c7ee3089f95529af1afd407d3 (diff)
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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')
-rw-r--r--test/Transforms/DeadStoreElimination/2011-03-25-DSEMiscompile.ll22
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
+}