diff options
Diffstat (limited to 'lib/VMCore/ConstantFold.cpp')
-rw-r--r-- | lib/VMCore/ConstantFold.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 7f713d15c6..2449739aaf 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/lib/VMCore/ConstantFold.cpp @@ -1839,14 +1839,16 @@ Constant *llvm::ConstantFoldCompareInstruction(LLVMContext &Context, } } - if (!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) { + if ((!isa<ConstantExpr>(C1) && isa<ConstantExpr>(C2)) || + (C1->isNullValue() && !C2->isNullValue())) { // If C2 is a constant expr and C1 isn't, flip them around and fold the // other way if possible. + // Also, if C1 is null and C2 isn't, flip them around. switch (pred) { case ICmpInst::ICMP_EQ: case ICmpInst::ICMP_NE: // No change of predicate required. - return ConstantFoldCompareInstruction(Context, pred, C2, C1); + return ConstantExpr::getICmp(pred, C2, C1); case ICmpInst::ICMP_ULT: case ICmpInst::ICMP_SLT: @@ -1858,7 +1860,7 @@ Constant *llvm::ConstantFoldCompareInstruction(LLVMContext &Context, case ICmpInst::ICMP_SGE: // Change the predicate as necessary to swap the operands. pred = ICmpInst::getSwappedPredicate((ICmpInst::Predicate)pred); - return ConstantFoldCompareInstruction(Context, pred, C2, C1); + return ConstantExpr::getICmp(pred, C2, C1); default: // These predicates cannot be flopped around. break; |