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switch to Type::getFPMantissaWidth instead of reinventing it. 

llvm-svn: 51275
This commit is contained in:
Chris Lattner 2008-05-19 21:17:23 +00:00
parent c958c4c22c
commit b42712288e
1 changed files with 3 additions and 15 deletions
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18
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -420,18 +420,6 @@ static const Type *getPromotedType(const Type *Ty) {
return Ty;
}
/// GetFPMantissaWidth - Return the width of the mantissa (aka significand) of
/// the specified floating point type in bits. This returns -1 if unknown.
static int GetFPMantissaWidth(const Type *FPType) {
if (FPType == Type::FloatTy)
return 24;
if (FPType == Type::DoubleTy)
return 53;
if (FPType == Type::X86_FP80Ty)
return 64;
return -1; // Unknown/crazy type.
}
/// getBitCastOperand - If the specified operand is a CastInst or a constant
/// expression bitcast, return the operand value, otherwise return null.
static Value *getBitCastOperand(Value *V) {
@ -5257,7 +5245,7 @@ Instruction *InstCombiner::FoldFCmp_IntToFP_Cst(FCmpInst &I,
// Get the width of the mantissa. We don't want to hack on conversions that
// might lose information from the integer, e.g. "i64 -> float"
int MantissaWidth = GetFPMantissaWidth(LHSI->getType());
int MantissaWidth = LHSI->getType()->getFPMantissaWidth();
if (MantissaWidth == -1) return 0; // Unknown.
// Check to see that the input is converted from an integer type that is small
@ -8007,7 +7995,7 @@ Instruction *InstCombiner::visitFPToUI(FPToUIInst &FI) {
if (UIToFPInst *SrcI = dyn_cast<UIToFPInst>(FI.getOperand(0)))
if (SrcI->getOperand(0)->getType() == FI.getType() &&
(int)FI.getType()->getPrimitiveSizeInBits() < /*extra bit for sign */
GetFPMantissaWidth(SrcI->getType()))
SrcI->getType()->getFPMantissaWidth())
return ReplaceInstUsesWith(FI, SrcI->getOperand(0));
return commonCastTransforms(FI);
@ -8020,7 +8008,7 @@ Instruction *InstCombiner::visitFPToSI(FPToSIInst &FI) {
if (SIToFPInst *SrcI = dyn_cast<SIToFPInst>(FI.getOperand(0)))
if (SrcI->getOperand(0)->getType() == FI.getType() &&
(int)FI.getType()->getPrimitiveSizeInBits() <=
GetFPMantissaWidth(SrcI->getType()))
SrcI->getType()->getFPMantissaWidth())
return ReplaceInstUsesWith(FI, SrcI->getOperand(0));
return commonCastTransforms(FI);