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Be more aggressive about removing joined physreg copies.

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When a joined COPY changes subreg liveness, we keep it around as a KILL,
otherwise it is safe to delete.

llvm-svn: 110403
This commit is contained in:
Jakob Stoklund Olesen 2010-08-05 23:51:28 +00:00
parent 1067cd1da0
commit 0390da8c45
1 changed files with 10 additions and 3 deletions
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13
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -1726,7 +1726,8 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
bool DoDelete = true;
assert(MI->isCopyLike() && "Unrecognized copy instruction");
unsigned SrcReg = MI->getOperand(MI->isSubregToReg() ? 2 : 1).getReg();
if (TargetRegisterInfo::isPhysicalRegister(SrcReg))
if (TargetRegisterInfo::isPhysicalRegister(SrcReg) &&
MI->getNumOperands() > 2)
// Do not delete extract_subreg, insert_subreg of physical
// registers unless the definition is dead. e.g.
// %DO<def> = INSERT_SUBREG %D0<undef>, %S0<kill>, 1
@ -1740,9 +1741,15 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
ShortenDeadCopyLiveRange(li, MI);
DoDelete = true;
}
if (!DoDelete)
if (!DoDelete) {
// We need the instruction to adjust liveness, so make it a KILL.
if (MI->isSubregToReg()) {
MI->RemoveOperand(3);
MI->RemoveOperand(1);
}
MI->setDesc(tii_->get(TargetOpcode::KILL));
mii = llvm::next(mii);
else {
} else {
li_->RemoveMachineInstrFromMaps(MI);
mii = mbbi->erase(mii);
++numPeep;