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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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9
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) {
@ -312,8 +313,8 @@ 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;
unsigned UseIdx = li_->getInstructionIndex(UseMI);
@ -323,7 +324,8 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
UseMO.setReg(NewReg);
if (UseMO.isKill())
BKills.push_back(li_->getUseIndex(UseIdx)+1);
if (UseMI != CopyMI) {
if (UseMI == CopyMI)
continue;
unsigned SrcReg, DstReg;
if (!tii_->isMoveInstr(*UseMI, SrcReg, DstReg))
continue;
@ -354,7 +356,6 @@ bool SimpleRegisterCoalescing::RemoveCopyByCommutingDef(LiveInterval &IntA,
}
}
}
}
// We need to insert a new liverange: [ALR.start, LastUse). It may be we can
// simply extend BLR if CopyMI doesn't end the range.