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Make sure the selector emits register register copies with flag operands 

linking them to calls when appropriate, this prevents the scheduler from
pulling these copies away from the call.

This fixes Ptrdist/yacr2

llvm-svn: 23143
This commit is contained in:
Chris Lattner 2005-08-30 01:57:02 +00:00
parent 709190d540
commit 7a59b1cf90
1 changed files with 20 additions and 10 deletions
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30
llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -1512,6 +1512,8 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
PPC::F8, PPC::F9, PPC::F10, PPC::F11, PPC::F12, PPC::F13
};
SDOperand InFlag; // Null incoming flag value.
for (unsigned i = 2, e = N->getNumOperands(); i != e; ++i) {
unsigned DestReg = 0;
MVT::ValueType RegTy;
@ -1528,17 +1530,21 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
}
if (N->getOperand(i).getOpcode() != ISD::UNDEF) {
SDOperand Reg = CurDAG->getRegister(DestReg, RegTy);
Chain = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg,
Select(N->getOperand(i)));
CallOperands.push_back(Reg);
Chain = CurDAG->getCopyToReg(Chain, DestReg,
Select(N->getOperand(i)), InFlag);
InFlag = Chain.getValue(1);
CallOperands.push_back(CurDAG->getRegister(DestReg, RegTy));
}
}
// Finally, once everything is in registers to pass to the call, emit the
// call itself.
CallOperands.push_back(Chain);
Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, CallOperands);
if (InFlag.Val)
CallOperands.push_back(InFlag); // Strong dep on register copies.
else
CallOperands.push_back(Chain); // Weak dep on whatever occurs before
Chain = CurDAG->getTargetNode(CallOpcode, MVT::Other, MVT::Flag,
CallOperands);
std::vector<SDOperand> CallResults;
@ -1548,18 +1554,22 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
case MVT::Other: break;
case MVT::i32:
if (N->getValueType(1) == MVT::i32) {
Chain = CurDAG->getCopyFromReg(Chain, PPC::R4, MVT::i32).getValue(1);
Chain = CurDAG->getCopyFromReg(Chain, PPC::R4, MVT::i32,
Chain.getValue(1)).getValue(1);
CallResults.push_back(Chain.getValue(0));
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32,
Chain.getValue(1)).getValue(1);
CallResults.push_back(Chain.getValue(0));
} else {
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32).getValue(1);
Chain = CurDAG->getCopyFromReg(Chain, PPC::R3, MVT::i32,
Chain.getValue(1)).getValue(1);
CallResults.push_back(Chain.getValue(0));
}
break;
case MVT::f32:
case MVT::f64:
Chain = CurDAG->getCopyFromReg(Chain, PPC::F1, MVT::f64).getValue(1);
Chain = CurDAG->getCopyFromReg(Chain, PPC::F1, MVT::f64,
Chain.getValue(1)).getValue(1);
if (N->getValueType(0) == MVT::f64)
CallResults.push_back(Chain.getValue(0));
else