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Make sure the selector emits register register copies with flag operands

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

This fixes Ptrdist/yacr2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-30 01:57:02 +00:00
parent e3f1026683
commit 31ce12f4f5
1 changed files with 20 additions and 10 deletions
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30
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