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Some code clean up.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47060 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-02-13 09:56:03 +00:00
parent b1f6f91393
commit cdbcfccece
1 changed files with 34 additions and 33 deletions
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67
lib/CodeGen/SimpleRegisterCoalescing.cpp
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@ -293,7 +293,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
}
}
// Commute def machine instr.
// At this point we have decided that it is legal to do this
// transformation. Start by commuting the instruction.
MachineBasicBlock *MBB = DefMI->getParent();
MachineInstr *NewMI = tii_->commuteInstruction(DefMI);
if (NewMI != DefMI) {
@ -312,10 +313,10 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
for (MachineRegisterInfo::use_iterator UI = mri_->use_begin(IntA.reg),
UE = mri_->use_end(); UI != UE;) {
MachineOperand &UseMO = UI.getOperand();
MachineInstr *UseMI = &*UI;
++UI;
MachineInstr *UseMI = UseMO.getParent();
if (JoinedCopies.count(UseMI))
continue;
if (JoinedCopies.count(UseMI))
continue;
unsigned UseIdx = li_->getInstructionIndex(UseMI);
LiveInterval::iterator ULR = IntA.FindLiveRangeContaining(UseIdx);
if (ULR->valno != AValNo)
@ -323,35 +324,35 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
UseMO.setReg(NewReg);
if (UseMO.isKill())
BKills.push_back(li_->getUseIndex(UseIdx)+1);
if (UseMI != CopyMI) {
unsigned SrcReg, DstReg;
if (!tii_->isMoveInstr(*UseMI, SrcReg, DstReg))
continue;
unsigned repDstReg = rep(DstReg);
if (repDstReg != IntB.reg) {
// Update dst register interval val# since its source register has
// changed.
LiveInterval &DLI = li_->getInterval(repDstReg);
LiveInterval::iterator DLR =
DLI.FindLiveRangeContaining(li_->getDefIndex(UseIdx));
DLR->valno->reg = NewReg;
ChangedCopies.insert(UseMI);
} else {
// This copy will become a noop. If it's defining a new val#,
// remove that val# as well. However this live range is being
// extended to the end of the existing live range defined by the copy.
unsigned DefIdx = li_->getDefIndex(UseIdx);
LiveInterval::iterator DLR = IntB.FindLiveRangeContaining(DefIdx);
BHasPHIKill |= DLR->valno->hasPHIKill;
assert(DLR->valno->def == DefIdx);
BDeadValNos.push_back(DLR->valno);
BExtend[DLR->start] = DLR->end;
JoinedCopies.insert(UseMI);
// If this is a kill but it's going to be removed, the last use
// of the same val# is the new kill.
if (UseMO.isKill()) {
BKills.pop_back();
}
if (UseMI == CopyMI)
continue;
unsigned SrcReg, DstReg;
if (!tii_->isMoveInstr(*UseMI, SrcReg, DstReg))
continue;
unsigned repDstReg = rep(DstReg);
if (repDstReg != IntB.reg) {
// Update dst register interval val# since its source register has
// changed.
LiveInterval &DLI = li_->getInterval(repDstReg);
LiveInterval::iterator DLR =
DLI.FindLiveRangeContaining(li_->getDefIndex(UseIdx));
DLR->valno->reg = NewReg;
ChangedCopies.insert(UseMI);
} else {
// This copy will become a noop. If it's defining a new val#,
// remove that val# as well. However this live range is being
// extended to the end of the existing live range defined by the copy.
unsigned DefIdx = li_->getDefIndex(UseIdx);
LiveInterval::iterator DLR = IntB.FindLiveRangeContaining(DefIdx);
BHasPHIKill |= DLR->valno->hasPHIKill;
assert(DLR->valno->def == DefIdx);
BDeadValNos.push_back(DLR->valno);
BExtend[DLR->start] = DLR->end;
JoinedCopies.insert(UseMI);
// If this is a kill but it's going to be removed, the last use
// of the same val# is the new kill.
if (UseMO.isKill()) {
BKills.pop_back();
}
}
}