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Refactor ExpandConstantFP so it can optimize load from constpool of types larger than f64 into extload from smaller types.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-03-04 08:05:30 +00:00
parent a26e0fe1b4
commit ef12057737
1 changed files with 19 additions and 16 deletions
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35
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -488,34 +488,37 @@ static SDOperand ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP,
// the constant pool as a float, even if it's is statically typed as a
// double.
MVT::ValueType VT = CFP->getValueType(0);
bool isDouble = VT == MVT::f64;
ConstantFP *LLVMC = ConstantFP::get(MVT::getTypeForValueType(VT),
CFP->getValueAPF());
if (!UseCP) {
if (VT!=MVT::f64 && VT!=MVT::f32)
assert(0 && "Invalid type expansion");
return DAG.getConstant(LLVMC->getValueAPF().convertToAPInt().getZExtValue(),
isDouble ? MVT::i64 : MVT::i32);
(VT == MVT::f64) ? MVT::i64 : MVT::i32);
}
if (isDouble && CFP->isValueValidForType(MVT::f32, CFP->getValueAPF()) &&
// Only do this if the target has a native EXTLOAD instruction from f32.
// Do not try to be clever about long doubles (so far)
TLI.isLoadXLegal(ISD::EXTLOAD, MVT::f32)) {
LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC,Type::FloatTy));
VT = MVT::f32;
Extend = true;
MVT::ValueType OrigVT = VT;
MVT::ValueType SVT = VT;
while (SVT != MVT::f32) {
SVT = (unsigned)SVT - 1;
if (CFP->isValueValidForType(SVT, CFP->getValueAPF()) &&
// Only do this if the target has a native EXTLOAD instruction from
// smaller type.
TLI.isLoadXLegal(ISD::EXTLOAD, SVT)) {
const Type *SType = MVT::getTypeForValueType(SVT);
LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC, SType));
VT = SVT;
Extend = true;
}
}
SDOperand CPIdx = DAG.getConstantPool(LLVMC, TLI.getPointerTy());
if (Extend) {
return DAG.getExtLoad(ISD::EXTLOAD, MVT::f64, DAG.getEntryNode(),
if (Extend)
return DAG.getExtLoad(ISD::EXTLOAD, OrigVT, DAG.getEntryNode(),
CPIdx, PseudoSourceValue::getConstantPool(),
0, MVT::f32);
} else {
return DAG.getLoad(VT, DAG.getEntryNode(), CPIdx,
PseudoSourceValue::getConstantPool(), 0);
}
0, VT);
return DAG.getLoad(OrigVT, DAG.getEntryNode(), CPIdx,
PseudoSourceValue::getConstantPool(), 0);
}