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RegisterCoalescer: Some cleanup in removeCopyByCommutingDef(), NFC 

llvm-svn: 225502
This commit is contained in:
Matthias Braun 2015-01-09 03:01:28 +00:00
parent 55586a2f2d
commit ea399e59cf
1 changed files with 19 additions and 15 deletions
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34
llvm/lib/CodeGen/RegisterCoalescer.cpp
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@ -602,7 +602,7 @@ static void addSegmentsWithValNo(LiveRange &Dst, VNInfo *DstValNo,
///
/// B2 = op B0 A2<kill>
/// ...
/// B1 = B2 <- now an identify copy
/// B1 = B2 <- now an identity copy
/// ...
/// = op B2 <- more uses
///
@ -610,17 +610,16 @@ static void addSegmentsWithValNo(LiveRange &Dst, VNInfo *DstValNo,
///
bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
MachineInstr *CopyMI) {
assert (!CP.isPhys());
SlotIndex CopyIdx = LIS->getInstructionIndex(CopyMI).getRegSlot();
assert(!CP.isPhys());
LiveInterval &IntA =
LIS->getInterval(CP.isFlipped() ? CP.getDstReg() : CP.getSrcReg());
LIS->getInterval(CP.isFlipped() ? CP.getDstReg() : CP.getSrcReg());
LiveInterval &IntB =
LIS->getInterval(CP.isFlipped() ? CP.getSrcReg() : CP.getDstReg());
LIS->getInterval(CP.isFlipped() ? CP.getSrcReg() : CP.getDstReg());
// BValNo is a value number in B that is defined by a copy from A. 'B1' in
// the example above.
SlotIndex CopyIdx = LIS->getInstructionIndex(CopyMI).getRegSlot();
VNInfo *BValNo = IntB.getVNInfoAt(CopyIdx);
assert(BValNo != nullptr && BValNo->def == CopyIdx);
@ -706,7 +705,8 @@ bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
// Update uses of IntA of the specific Val# with IntB.
for (MachineRegisterInfo::use_iterator UI = MRI->use_begin(IntA.reg),
UE = MRI->use_end(); UI != UE;) {
UE = MRI->use_end();
UI != UE;) {
MachineOperand &UseMO = *UI;
if (UseMO.isUndef())
continue;
@ -779,7 +779,8 @@ bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
if (Common == 0)
continue;
DEBUG(dbgs() << format("\t\tCopy+Merge %04X into %04X\n", BMask, Common));
DEBUG(
dbgs() << format("\t\tCopy+Merge %04X into %04X\n", BMask, Common));
unsigned BRest = BMask & ~AMask;
LiveInterval::SubRange *CommonRange;
if (BRest != 0) {
@ -808,13 +809,6 @@ bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
}
SA.removeValNo(ASubValNo);
}
} else if (IntA.hasSubRanges()) {
SlotIndex AIdx = CopyIdx.getRegSlot(true);
for (LiveInterval::SubRange &SA : IntA.subranges()) {
VNInfo *ASubValNo = SA.getVNInfoAt(AIdx);
assert(ASubValNo != nullptr);
SA.removeValNo(ASubValNo);
}
}
BValNo->def = AValNo->def;
@ -822,6 +816,16 @@ bool RegisterCoalescer::removeCopyByCommutingDef(const CoalescerPair &CP,
DEBUG(dbgs() << "\t\textended: " << IntB << '\n');
IntA.removeValNo(AValNo);
// Remove valuenos in subranges (the A+B have subranges case has already been
// handled above)
if (!IntB.hasSubRanges()) {
SlotIndex AIdx = CopyIdx.getRegSlot(true);
for (LiveInterval::SubRange &SA : IntA.subranges()) {
VNInfo *ASubValNo = SA.getVNInfoAt(AIdx);
assert(ASubValNo != nullptr);
SA.removeValNo(ASubValNo);
}
}
DEBUG(dbgs() << "\t\ttrimmed: " << IntA << '\n');
++numCommutes;
return true;