[llvm-commits] CVS: llvm/lib/VMCore/ConstantFolding.cpp
Chris Lattner
lattner at cs.uiuc.edu
Sat Oct 16 21:02:04 PDT 2004
Changes in directory llvm/lib/VMCore:
ConstantFolding.cpp updated: 1.65 -> 1.66
---
Log message:
Fix constant folding relational operators with undef operands.
---
Diffs of the changes: (+4 -7)
Index: llvm/lib/VMCore/ConstantFolding.cpp
diff -u llvm/lib/VMCore/ConstantFolding.cpp:1.65 llvm/lib/VMCore/ConstantFolding.cpp:1.66
--- llvm/lib/VMCore/ConstantFolding.cpp:1.65 Sat Oct 16 18:31:32 2004
+++ llvm/lib/VMCore/ConstantFolding.cpp Sat Oct 16 23:01:51 2004
@@ -830,7 +830,9 @@
// If we successfully folded the expression, return it now.
if (C) return C;
- if (SetCondInst::isRelational(Opcode))
+ if (SetCondInst::isRelational(Opcode)) {
+ if (isa<UndefValue>(V1) || isa<UndefValue>(V2))
+ return UndefValue::get(Type::BoolTy);
switch (evaluateRelation(V1, V2)) {
default: assert(0 && "Unknown relational!");
case Instruction::BinaryOpsEnd:
@@ -871,17 +873,12 @@
if (Opcode == Instruction::SetNE) return ConstantBool::True;
break;
}
+ }
if (isa<UndefValue>(V1) || isa<UndefValue>(V2)) {
switch (Opcode) {
case Instruction::Add:
case Instruction::Sub:
- case Instruction::SetEQ:
- case Instruction::SetNE:
- case Instruction::SetLT:
- case Instruction::SetLE:
- case Instruction::SetGT:
- case Instruction::SetGE:
case Instruction::Xor:
return UndefValue::get(V1->getType());
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