forked from OSchip/llvm-project
We can fold promoted and non-promoted loads into divs also!
llvm-svn: 19835
This commit is contained in:
parent
30607ec66e
commit
1b20615173
llvm/lib/Target/X86
|
@ -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();
|
||||
|
|
Loading…
Reference in New Issue