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Don't perform expensive queries checking for super and sub registers when we know that there aren't any.

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This speed up LiveVariables on instcombine at -O0 -g from 0.3855s to 0.3503s.  Look for more improvements in this area soon!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-06-27 01:22:50 +00:00
parent e6b6bae536
commit b827c26e1e
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/MachineInstr.cpp
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@ -780,6 +780,7 @@ bool MachineInstr::addRegisterDead(unsigned IncomingReg,
const TargetRegisterInfo *RegInfo,
bool AddIfNotFound) {
bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg) == 0;
bool Found = false;
SmallVector<unsigned,4> DeadOps;
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
@ -790,7 +791,7 @@ bool MachineInstr::addRegisterDead(unsigned IncomingReg,
if (Reg == IncomingReg) {
MO.setIsDead();
Found = true;
} else if (isPhysReg && MO.isDead() &&
} else if (hasAliases && MO.isDead() &&
TargetRegisterInfo::isPhysicalRegister(Reg)) {
// There exists a super-register that's marked dead.
if (RegInfo->isSuperRegister(IncomingReg, Reg))