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Treat int constants as not requiring a register, since they are almost always

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folded into an instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19486 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-11 22:29:12 +00:00
parent c871e1d56f
commit c4b6a78980
1 changed files with 22 additions and 14 deletions
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36
lib/Target/X86/X86ISelPattern.cpp
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@ -388,22 +388,30 @@ unsigned ISel::ComputeRegPressure(SDOperand O) {
// FIXME: Should operations like CALL (which clobber lots o regs) have a
// higher fixed cost??
if (N->getNumOperands() == 0)
return Result = 1;
unsigned MaxRegUse = 0;
unsigned NumExtraMaxRegUsers = 0;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
unsigned Regs = ComputeRegPressure(N->getOperand(i));
if (Regs > MaxRegUse) {
MaxRegUse = Regs;
NumExtraMaxRegUsers = 0;
} else if (Regs == MaxRegUse) {
++NumExtraMaxRegUsers;
if (N->getNumOperands() == 0) {
Result = 1;
} else {
unsigned MaxRegUse = 0;
unsigned NumExtraMaxRegUsers = 0;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
unsigned Regs;
if (N->getOperand(i).getOpcode() == ISD::Constant)
Regs = 0;
else
Regs = ComputeRegPressure(N->getOperand(i));
if (Regs > MaxRegUse) {
MaxRegUse = Regs;
NumExtraMaxRegUsers = 0;
} else if (Regs == MaxRegUse &&
N->getOperand(i).getValueType() != MVT::Other) {
++NumExtraMaxRegUsers;
}
}
}
return Result = MaxRegUse+NumExtraMaxRegUsers;
Result = MaxRegUse+NumExtraMaxRegUsers;
}
std::cerr << " WEIGHT: " << Result << " "; N->dump(); std::cerr << "\n";
return Result;
}
/// SelectAddress - Add the specified node to the specified addressing mode,