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Replace a big gob of old coalescer logic with the new CoalescerPair class.

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CoalescerPair can determine if a copy can be coalesced, and which register gets
merged away. The old logic in SimpleRegisterCoalescing had evolved into
something a bit too convoluted.

This second attempt fixes some crashes that only occurred Linux.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106769 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-06-24 18:15:01 +00:00
parent fc33a3099e
commit a24986d8bf
5 changed files with 228 additions and 741 deletions
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12
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -218,10 +218,7 @@ bool LiveIntervals::conflictsWithPhysReg(const LiveInterval &li,
return false;
}
/// conflictsWithSubPhysRegRef - Similar to conflictsWithPhysRegRef except
/// it checks for sub-register reference and it can check use as well.
bool LiveIntervals::conflictsWithSubPhysRegRef(LiveInterval &li,
unsigned Reg, bool CheckUse,
bool LiveIntervals::conflictsWithAliasRef(LiveInterval &li, unsigned Reg,
SmallPtrSet<MachineInstr*,32> &JoinedCopies) {
for (LiveInterval::Ranges::const_iterator
I = li.ranges.begin(), E = li.ranges.end(); I != E; ++I) {
@ -239,12 +236,11 @@ bool LiveIntervals::conflictsWithSubPhysRegRef(LiveInterval &li,
MachineOperand& MO = MI->getOperand(i);
if (!MO.isReg())
continue;
if (MO.isUse() && !CheckUse)
continue;
unsigned PhysReg = MO.getReg();
if (PhysReg == 0 || TargetRegisterInfo::isVirtualRegister(PhysReg))
if (PhysReg == 0 || PhysReg == Reg ||
TargetRegisterInfo::isVirtualRegister(PhysReg))
continue;
if (tri_->isSubRegister(Reg, PhysReg))
if (tri_->regsOverlap(Reg, PhysReg))
return true;
}
}