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add a simplified accessor for creating an fp constant of a

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particular value but variable type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-04-09 06:38:30 +00:00
parent f20d943bc6
commit 288e78fbe7
1 changed files with 25 additions and 13 deletions
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38
lib/VMCore/Constants.cpp
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@ -246,21 +246,24 @@ ConstantInt *ConstantInt::get(const APInt& V) {
// ConstantFP
//===----------------------------------------------------------------------===//
static const fltSemantics *TypeToFloatSemantics(const Type *Ty) {
if (Ty == Type::FloatTy)
return &APFloat::IEEEsingle;
if (Ty == Type::DoubleTy)
return &APFloat::IEEEdouble;
if (Ty == Type::X86_FP80Ty)
return &APFloat::x87DoubleExtended;
else if (Ty == Type::FP128Ty)
return &APFloat::IEEEquad;
assert(Ty == Type::PPC_FP128Ty && "Unknown FP format");
return &APFloat::PPCDoubleDouble;
}
ConstantFP::ConstantFP(const Type *Ty, const APFloat& V)
: Constant(Ty, ConstantFPVal, 0, 0), Val(V) {
// temporary
if (Ty==Type::FloatTy)
assert(&V.getSemantics()==&APFloat::IEEEsingle);
else if (Ty==Type::DoubleTy)
assert(&V.getSemantics()==&APFloat::IEEEdouble);
else if (Ty==Type::X86_FP80Ty)
assert(&V.getSemantics()==&APFloat::x87DoubleExtended);
else if (Ty==Type::FP128Ty)
assert(&V.getSemantics()==&APFloat::IEEEquad);
else if (Ty==Type::PPC_FP128Ty)
assert(&V.getSemantics()==&APFloat::PPCDoubleDouble);
else
assert(0);
assert(&V.getSemantics() == TypeToFloatSemantics(Ty) &&
"FP type Mismatch");
}
bool ConstantFP::isNullValue() const {
@ -335,6 +338,15 @@ ConstantFP *ConstantFP::get(const APFloat &V) {
return Slot = new ConstantFP(Ty, V);
}
/// get() - This returns a constant fp for the specified value in the
/// specified type. This should only be used for simple constant values like
/// 2.0/1.0 etc, that are known-valid both as double and as the target format.
ConstantFP *ConstantFP::get(const Type *Ty, double V) {
APFloat FV(V);
FV.convert(*TypeToFloatSemantics(Ty), APFloat::rmNearestTiesToEven);
return get(FV);
}
//===----------------------------------------------------------------------===//
// ConstantXXX Classes
//===----------------------------------------------------------------------===//