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make this code more aggressive about turning store fpimm into store int imm. 

This is not sufficient to fix X86/store-fp-constant.ll

llvm-svn: 32465
This commit is contained in:
Chris Lattner 2006-12-12 04:16:14 +00:00
parent f929e81d37
commit b7524b6d0e
1 changed files with 32 additions and 9 deletions
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29
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3038,15 +3038,38 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Value)) {
if (Value.getOpcode() != ISD::TargetConstantFP) {
SDOperand Tmp;
if (CFP->getValueType(0) == MVT::f32) {
switch (CFP->getValueType(0)) {
default: assert(0 && "Unknown FP type");
case MVT::f32:
if (!AfterLegalize || TLI.isTypeLegal(MVT::i32)) {
Tmp = DAG.getConstant(FloatToBits(CFP->getValue()), MVT::i32);
return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(),
ST->getSrcValueOffset());
} else if (TLI.isTypeLegal(MVT::i64)) {
assert(CFP->getValueType(0) == MVT::f64 && "Unknown FP type!");
}
break;
case MVT::f64:
if (!AfterLegalize || TLI.isTypeLegal(MVT::i64)) {
Tmp = DAG.getConstant(DoubleToBits(CFP->getValue()), MVT::i64);
return DAG.getStore(Chain, Tmp, Ptr, ST->getSrcValue(),
ST->getSrcValueOffset());
} else if (TLI.isTypeLegal(MVT::i32)) {
// Many FP stores are not make apparent until after legalize, e.g. for
// argument passing. Since this is so common, custom legalize the
// 64-bit integer store into two 32-bit stores.
uint64_t Val = DoubleToBits(CFP->getValue());
SDOperand Lo = DAG.getConstant(Val & 0xFFFFFFFF, MVT::i32);
SDOperand Hi = DAG.getConstant(Val >> 32, MVT::i32);
if (!TLI.isLittleEndian()) std::swap(Lo, Hi);
SDOperand St0 = DAG.getStore(Chain, Lo, Ptr, ST->getSrcValue(),
ST->getSrcValueOffset());
Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
DAG.getConstant(4, Ptr.getValueType()));
SDOperand St1 = DAG.getStore(Chain, Hi, Ptr, ST->getSrcValue(),
ST->getSrcValueOffset()+4);
return DAG.getNode(ISD::TokenFactor, MVT::Other, St0, St1);
}
break;
}
}
}