Add FNeg IR constant folding support
llvm-svn: 359982
diff --git a/llvm/lib/IR/Constants.cpp b/llvm/lib/IR/Constants.cpp
index 00c7226..5545eb4 100644
--- a/llvm/lib/IR/Constants.cpp
+++ b/llvm/lib/IR/Constants.cpp
@@ -1830,7 +1830,8 @@
}
#endif
- // TODO: Try to constant fold operation.
+ if (Constant *FC = ConstantFoldUnaryInstruction(Opcode, C))
+ return FC;
if (OnlyIfReducedTy == C->getType())
return nullptr;
@@ -1909,7 +1910,7 @@
#endif
if (Constant *FC = ConstantFoldBinaryInstruction(Opcode, C1, C2))
- return FC; // Fold a few common cases.
+ return FC;
if (OnlyIfReducedTy == C1->getType())
return nullptr;
@@ -2235,7 +2236,7 @@
Constant *ConstantExpr::getFNeg(Constant *C) {
assert(C->getType()->isFPOrFPVectorTy() &&
"Cannot FNEG a non-floating-point value!");
- return getFSub(ConstantFP::getZeroValueForNegation(C->getType()), C);
+ return get(Instruction::FNeg, C);
}
Constant *ConstantExpr::getNot(Constant *C) {
@@ -3024,7 +3025,8 @@
case Instruction::FCmp:
return CmpInst::Create((Instruction::OtherOps)getOpcode(),
(CmpInst::Predicate)getPredicate(), Ops[0], Ops[1]);
-
+ case Instruction::FNeg:
+ return UnaryOperator::Create((Instruction::UnaryOps)getOpcode(), Ops[0]);
default:
assert(getNumOperands() == 2 && "Must be binary operator?");
BinaryOperator *BO =