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Simplyfy RegAllocBasic by using getOverlaps instead of getAliasSet. 

llvm-svn: 121801
This commit is contained in:
Jakob Stoklund Olesen 2010-12-14 23:10:48 +00:00
parent 757f0e37ea
commit 6a5bf7782a
1 changed files with 4 additions and 14 deletions
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18
llvm/lib/CodeGen/RegAllocBasic.cpp
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@ -285,12 +285,9 @@ void RegAllocBase::allocatePhysRegs() {
// physical register. Return the interfering register.
unsigned RegAllocBase::checkPhysRegInterference(LiveInterval &VirtReg,
unsigned PhysReg) {
if (query(VirtReg, PhysReg).checkInterference())
return PhysReg;
for (const unsigned *AliasI = TRI->getAliasSet(PhysReg); *AliasI; ++AliasI) {
for (const unsigned *AliasI = TRI->getOverlaps(PhysReg); *AliasI; ++AliasI)
if (query(VirtReg, *AliasI).checkInterference())
return *AliasI;
}
return 0;
}
@ -331,15 +328,9 @@ RegAllocBase::spillInterferences(LiveInterval &VirtReg, unsigned PhysReg,
SmallVectorImpl<LiveInterval*> &SplitVRegs) {
// Record each interference and determine if all are spillable before mutating
// either the union or live intervals.
// Collect interferences assigned to the requested physical register.
LiveIntervalUnion::Query &QPreg = query(VirtReg, PhysReg);
unsigned NumInterferences = QPreg.collectInterferingVRegs();
if (QPreg.seenUnspillableVReg()) {
return false;
}
unsigned NumInterferences = 0;
// Collect interferences assigned to any alias of the physical register.
for (const unsigned *asI = TRI->getAliasSet(PhysReg); *asI; ++asI) {
for (const unsigned *asI = TRI->getOverlaps(PhysReg); *asI; ++asI) {
LiveIntervalUnion::Query &QAlias = query(VirtReg, *asI);
NumInterferences += QAlias.collectInterferingVRegs();
if (QAlias.seenUnspillableVReg()) {
@ -351,8 +342,7 @@ RegAllocBase::spillInterferences(LiveInterval &VirtReg, unsigned PhysReg,
assert(NumInterferences > 0 && "expect interference");
// Spill each interfering vreg allocated to PhysReg or an alias.
spillReg(VirtReg, PhysReg, SplitVRegs);
for (const unsigned *AliasI = TRI->getAliasSet(PhysReg); *AliasI; ++AliasI)
for (const unsigned *AliasI = TRI->getOverlaps(PhysReg); *AliasI; ++AliasI)
spillReg(VirtReg, *AliasI, SplitVRegs);
return true;
}