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Implement the 'store FPIMM, Ptr' -> 'store INTIMM, Ptr' optimization for 

all targets.

llvm-svn: 19366
This commit is contained in:
Chris Lattner 2005-01-08 06:25:56 +00:00
parent 9a97e4d5b6
commit e69daaf71d
1 changed files with 25 additions and 0 deletions
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25
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -424,6 +424,31 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.
Tmp2 = LegalizeOp(Node->getOperand(2)); // Legalize the pointer.
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
if (ConstantFPSDNode *CFP =
dyn_cast<ConstantFPSDNode>(Node->getOperand(1))) {
if (CFP->getValueType(0) == MVT::f32) {
union {
unsigned I;
float F;
} V;
V.F = CFP->getValue();
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1,
DAG.getConstant(V.I, MVT::i32), Tmp2);
} else {
assert(CFP->getValueType(0) == MVT::f64 && "Unknown FP type!");
union {
uint64_t I;
double F;
} V;
V.F = CFP->getValue();
Result = DAG.getNode(ISD::STORE, MVT::Other, Tmp1,
DAG.getConstant(V.I, MVT::i64), Tmp2);
}
Op = Result;
Node = Op.Val;
}
switch (getTypeAction(Node->getOperand(1).getValueType())) {
case Legal: {
SDOperand Val = LegalizeOp(Node->getOperand(1));