6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-17 05:29:24 +00:00
Code Issues Projects Releases Wiki Activity

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

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
lib/CodeGen/MachineInstr.cpp
View File

@ -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))