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Fix how livein live intervals are handled. Previously it could end at MBB start. Sorry, no small test case possible.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66129 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-03-05 03:34:26 +00:00
parent 4084c4ee34
commit 0076c616e8
1 changed files with 9 additions and 4 deletions
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13
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -684,11 +684,13 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
getInstructionFromIndex(baseIndex) == 0)
baseIndex += InstrSlots::NUM;
unsigned end = baseIndex;
bool SeenDefUse = false;
while (mi != MBB->end()) {
if (mi->killsRegister(interval.reg, tri_)) {
DOUT << " killed";
end = getUseIndex(baseIndex) + 1;
SeenDefUse = true;
goto exit;
} else if (mi->modifiesRegister(interval.reg, tri_)) {
// Another instruction redefines the register before it is ever read.
@ -697,19 +699,22 @@ void LiveIntervals::handleLiveInRegister(MachineBasicBlock *MBB,
// [defSlot(def), defSlot(def)+1)
DOUT << " dead";
end = getDefIndex(start) + 1;
SeenDefUse = true;
goto exit;
}
baseIndex += InstrSlots::NUM;
while (baseIndex / InstrSlots::NUM < i2miMap_.size() &&
getInstructionFromIndex(baseIndex) == 0)
baseIndex += InstrSlots::NUM;
++mi;
if (mi != MBB->end()) {
while (baseIndex / InstrSlots::NUM < i2miMap_.size() &&
getInstructionFromIndex(baseIndex) == 0)
baseIndex += InstrSlots::NUM;
}
}
exit:
// Live-in register might not be used at all.
if (end == MIIdx) {
if (!SeenDefUse) {
if (isAlias) {
DOUT << " dead";
end = getDefIndex(MIIdx) + 1;