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Simplify early clobber slots a bit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144507 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-11-13 22:05:42 +00:00
parent 10252db69b
commit d14614e677
1 changed files with 3 additions and 12 deletions
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15
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -197,11 +197,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
LiveVariables::VarInfo& vi = lv_->getVarInfo(interval.reg);
if (interval.empty()) {
// Get the Idx of the defining instructions.
SlotIndex defIndex = MIIdx.getRegSlot();
// Earlyclobbers move back one, so that they overlap the live range
// of inputs.
if (MO.isEarlyClobber())
defIndex = MIIdx.getRegSlot(true);
SlotIndex defIndex = MIIdx.getRegSlot(MO.isEarlyClobber());
// Make sure the first definition is not a partial redefinition. Add an
// <imp-def> of the full register.
@ -323,9 +319,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// are actually two values in the live interval. Because of this we
// need to take the LiveRegion that defines this register and split it
// into two values.
SlotIndex RedefIndex = MIIdx.getRegSlot();
if (MO.isEarlyClobber())
RedefIndex = MIIdx.getRegSlot(true);
SlotIndex RedefIndex = MIIdx.getRegSlot(MO.isEarlyClobber());
const LiveRange *OldLR =
interval.getLiveRangeContaining(RedefIndex.getRegSlot(true));
@ -402,10 +396,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
DEBUG(dbgs() << "\t\tregister: " << PrintReg(interval.reg, tri_));
SlotIndex baseIndex = MIIdx;
SlotIndex start = baseIndex.getRegSlot();
// Earlyclobbers move back one.
if (MO.isEarlyClobber())
start = MIIdx.getRegSlot(true);
SlotIndex start = baseIndex.getRegSlot(MO.isEarlyClobber());
SlotIndex end = start;
// If it is not used after definition, it is considered dead at