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Improve comment, pass in the original VT so that we can shrink a long double constant

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all the way to float, not stopping at double.

llvm-svn: 47937
This commit is contained in:
Chris Lattner 2008-03-05 06:46:58 +00:00
parent d421708e35
commit 8e6367195e
1 changed files with 4 additions and 2 deletions
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6
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -486,7 +486,9 @@ static SDOperand ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP,
// If a FP immediate is precise when represented as a float and if the
// target can do an extending load from float to double, we put it into
// the constant pool as a float, even if it's is statically typed as a
// double.
// double. This shrinks FP constants and canonicalizes them for targets where
// an FP extending load is the same cost as a normal load (such as on the x87
// fp stack or PPC FP unit).
MVT::ValueType VT = CFP->getValueType(0);
ConstantFP *LLVMC = ConstantFP::get(MVT::getTypeForValueType(VT),
CFP->getValueAPF());
@ -505,7 +507,7 @@ static SDOperand ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP,
// Only do this if the target has a native EXTLOAD instruction from
// smaller type.
TLI.isLoadXLegal(ISD::EXTLOAD, SVT) &&
TLI.ShouldShrinkFPConstant(VT)) {
TLI.ShouldShrinkFPConstant(OrigVT)) {
const Type *SType = MVT::getTypeForValueType(SVT);
LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC, SType));
VT = SVT;