diff options
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 5c80a377ba..a61dd06ff1 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -1124,7 +1124,8 @@ Constant *llvm::ConstantFoldCompareInstruction(unsigned short pred, // icmp eq/ne(null,GV) -> false/true if (C1->isNullValue()) { if (const GlobalValue *GV = dyn_cast<GlobalValue>(C2)) - if (!GV->hasExternalWeakLinkage()) // External weak GV can be null + // Don't try to evaluate aliases. External weak GV can be null. + if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage()) if (pred == ICmpInst::ICMP_EQ) return ConstantInt::getFalse(); else if (pred == ICmpInst::ICMP_NE) @@ -1132,7 +1133,8 @@ Constant *llvm::ConstantFoldCompareInstruction(unsigned short pred, // icmp eq/ne(GV,null) -> false/true } else if (C2->isNullValue()) { if (const GlobalValue *GV = dyn_cast<GlobalValue>(C1)) - if (!GV->hasExternalWeakLinkage()) // External weak GV can be null + // Don't try to evaluate aliases. External weak GV can be null. + if (!isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage()) if (pred == ICmpInst::ICMP_EQ) return ConstantInt::getFalse(); else if (pred == ICmpInst::ICMP_NE) |