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Floating point negates are -0.0 - X, not 0.0 - X 

llvm-svn: 11084
This commit is contained in:
Chris Lattner 2004-02-02 20:21:29 +00:00
parent c2f0aa58df
commit bcade4b8e6
1 changed files with 13 additions and 5 deletions
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18
llvm/lib/VMCore/iOperators.cpp
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@ -78,9 +78,14 @@ BinaryOperator *BinaryOperator::create(BinaryOps Op, Value *S1, Value *S2,
BinaryOperator *BinaryOperator::createNeg(Value *Op, const std::string &Name,
Instruction *InsertBefore) {
return new BinaryOperator(Instruction::Sub,
Constant::getNullValue(Op->getType()), Op,
Op->getType(), Name, InsertBefore);
if (!Op->getType()->isFloatingPoint())
return new BinaryOperator(Instruction::Sub,
Constant::getNullValue(Op->getType()), Op,
Op->getType(), Name, InsertBefore);
else
return new BinaryOperator(Instruction::Sub,
ConstantFP::get(Op->getType(), -0.0), Op,
Op->getType(), Name, InsertBefore);
}
BinaryOperator *BinaryOperator::createNot(Value *Op, const std::string &Name,
@ -98,8 +103,11 @@ static inline bool isConstantAllOnes(const Value *V) {
bool BinaryOperator::isNeg(const Value *V) {
if (const BinaryOperator *Bop = dyn_cast<BinaryOperator>(V))
return Bop->getOpcode() == Instruction::Sub &&
Bop->getOperand(0) == Constant::getNullValue(Bop->getType());
if (Bop->getOpcode() == Instruction::Sub)
if (!V->getType()->isFloatingPoint())
return Bop->getOperand(0) == Constant::getNullValue(Bop->getType());
else
return Bop->getOperand(0) == ConstantFP::get(Bop->getType(), -0.0);
return false;
}