Do not ignore casts unless they are pointer-pointer casts. This caused us
to miscompile the SingleSource/Regression/C++/pointer_member.cpp program.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15062 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index f95adb3..c094907 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -240,10 +240,12 @@
const Value *V2, unsigned V2Size) {
// Strip off any constant expression casts if they exist
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V1))
- if (CE->getOpcode() == Instruction::Cast)
+ if (CE->getOpcode() == Instruction::Cast &&
+ isa<PointerType>(CE->getOperand(0)->getType()))
V1 = CE->getOperand(0);
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(V2))
- if (CE->getOpcode() == Instruction::Cast)
+ if (CE->getOpcode() == Instruction::Cast &&
+ isa<PointerType>(CE->getOperand(0)->getType()))
V2 = CE->getOperand(0);
// Are we checking for alias of the same value?
@@ -255,9 +257,11 @@
// Strip off cast instructions...
if (const Instruction *I = dyn_cast<CastInst>(V1))
- return alias(I->getOperand(0), V1Size, V2, V2Size);
+ if (isa<PointerType>(I->getOperand(0)->getType()))
+ return alias(I->getOperand(0), V1Size, V2, V2Size);
if (const Instruction *I = dyn_cast<CastInst>(V2))
- return alias(V1, V1Size, I->getOperand(0), V2Size);
+ if (isa<PointerType>(I->getOperand(0)->getType()))
+ return alias(V1, V1Size, I->getOperand(0), V2Size);
// Figure out what objects these things are pointing to if we can...
const Value *O1 = getUnderlyingObject(V1);