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Codegen factor nodes more intelligently according to perceived register pressure.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19532 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-13 19:56:00 +00:00
parent 5a6c6d98d5
commit 1d50b7fa53
1 changed files with 14 additions and 2 deletions
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16
lib/Target/X86/X86ISelPattern.cpp
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@ -2088,8 +2088,20 @@ void ISel::Select(SDOperand N) {
assert(0 && "Node not handled yet!");
case ISD::EntryToken: return; // Noop
case ISD::TokenFactor:
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
Select(Node->getOperand(i));
if (Node->getNumOperands() == 2) {
bool OneFirst =
getRegPressure(Node->getOperand(1))>getRegPressure(Node->getOperand(0));
Select(Node->getOperand(OneFirst));
Select(Node->getOperand(!OneFirst));
} else {
std::vector<std::pair<unsigned, unsigned> > OpsP;
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
OpsP.push_back(std::make_pair(getRegPressure(Node->getOperand(i)), i));
std::sort(OpsP.begin(), OpsP.end());
std::reverse(OpsP.begin(), OpsP.end());
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
Select(Node->getOperand(OpsP[i].second));
}
return;
case ISD::CopyToReg:
if (getRegPressure(N.getOperand(0)) > getRegPressure(N.getOperand(1))) {