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Teach regular and fast isel to set dead flags on unused implicit defs

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on calls and similar instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106353 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-06-18 23:28:01 +00:00
parent 8af5ed9e15
commit db4971259c
7 changed files with 69 additions and 0 deletions
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19
lib/CodeGen/MachineInstr.cpp
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@ -1461,6 +1461,25 @@ void MachineInstr::addRegisterDefined(unsigned IncomingReg,
true /*IsImp*/));
}
void MachineInstr::setPhysRegsDeadExcept(const SmallVectorImpl<unsigned> &UsedRegs,
const TargetRegisterInfo &TRI) {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
MachineOperand &MO = getOperand(i);
if (!MO.isReg() || !MO.isDef()) continue;
unsigned Reg = MO.getReg();
if (Reg == 0) continue;
bool Dead = true;
for (SmallVectorImpl<unsigned>::const_iterator I = UsedRegs.begin(),
E = UsedRegs.end(); I != E; ++I)
if (TRI.regsOverlap(*I, Reg)) {
Dead = false;
break;
}
// If there are no uses, including partial uses, the def is dead.
if (Dead) MO.setIsDead();
}
}
unsigned
MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
unsigned Hash = MI->getOpcode() * 37;