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We can fold promoted and non-promoted loads into divs also! 

llvm-svn: 19835
This commit is contained in:
Chris Lattner 2005-01-25 20:35:10 +00:00
parent 30607ec66e
commit 1b20615173
1 changed files with 28 additions and 0 deletions
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28
llvm/lib/Target/X86/X86ISelPattern.cpp
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@ -2034,6 +2034,34 @@ unsigned ISel::SelectExpr(SDOperand N) {
"We don't support this operator!");
if (N.getOpcode() == ISD::SDIV)
// We can fold loads into FpDIVs, but not really into any others.
if (N.getValueType() == MVT::f64) {
// Check for reversed and unreversed DIV.
if (isFoldableLoad(N.getOperand(0), N.getOperand(1), true)) {
if (N.getOperand(0).getOpcode() == ISD::EXTLOAD)
Opc = X86::FDIVR32m;
else
Opc = X86::FDIVR64m;
X86AddressMode AM;
EmitFoldedLoad(N.getOperand(0), AM);
Tmp1 = SelectExpr(N.getOperand(1));
addFullAddress(BuildMI(BB, Opc, 5, Result).addReg(Tmp1), AM);
return Result;
} else if (isFoldableLoad(N.getOperand(1), N.getOperand(0), true) &&
N.getOperand(1).getOpcode() == ISD::LOAD) {
if (N.getOperand(1).getOpcode() == ISD::EXTLOAD)
Opc = X86::FDIV32m;
else
Opc = X86::FDIV64m;
X86AddressMode AM;
EmitFoldedLoad(N.getOperand(1), AM);
Tmp1 = SelectExpr(N.getOperand(0));
addFullAddress(BuildMI(BB, Opc, 5, Result).addReg(Tmp1), AM);
return Result;
}
}
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
// FIXME: These special cases should be handled by the lowering impl!
unsigned RHS = CN->getValue();