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Improved PHI def marking, replaced some gotos with breaks. 

llvm-svn: 73727
This commit is contained in:
Lang Hames 2009-06-18 22:01:47 +00:00
parent 032bc36939
commit 32270cc78e
1 changed files with 7 additions and 5 deletions
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12
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -584,7 +584,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Replace the interval with one of a NEW value number. Note that this
// value number isn't actually defined by an instruction, weird huh? :)
LiveRange LR(Start, End, interval.getNextValue(0, 0, false, VNInfoAllocator));
LiveRange LR(Start, End, interval.getNextValue(Start, 0, false, VNInfoAllocator));
LR.valno->setIsPHIDef(true);
DOUT << " replace range with " << LR;
interval.addRange(LR);
@ -753,7 +753,7 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
DOUT << " killed";
end = getUseIndex(baseIndex) + 1;
SeenDefUse = true;
goto exit;
break;
} else if (mi->modifiesRegister(interval.reg, tri_)) {
// Another instruction redefines the register before it is ever read.
// Then the register is essentially dead at the instruction that defines
@ -762,7 +762,7 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
DOUT << " dead";
end = getDefIndex(start) + 1;
SeenDefUse = true;
goto exit;
break;
}
baseIndex += InstrSlots::NUM;
@ -774,7 +774,6 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
}
}
exit:
// Live-in register might not be used at all.
if (!SeenDefUse) {
if (isAlias) {
@ -786,7 +785,10 @@ exit:
}
}
LiveRange LR(start, end, interval.getNextValue(0, 0, false, VNInfoAllocator));
VNInfo *vni = interval.getNextValue(start, 0, false, VNInfoAllocator);
vni->setIsPHIDef(true);
LiveRange LR(start, end, vni);
interval.addRange(LR);
interval.addKill(LR.valno, end);
DOUT << " +" << LR << '\n';