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Fix my previous checkin to updatePressureDiffs.

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There was one case that we could hit a DebugValue where I didn't think
to check. DebugValues are evil. No checkinable test case, sorry. It's
an obvious fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189717 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-08-31 05:17:58 +00:00
parent cda04f9a0a
commit c94e7b50c3
1 changed files with 19 additions and 4 deletions
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23
lib/CodeGen/MachineScheduler.cpp
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@ -177,8 +177,9 @@ priorNonDebug(MachineBasicBlock::iterator I,
/// If this iterator is a debug value, increment until reaching the End or a
/// non-debug instruction.
static MachineBasicBlock::iterator
nextIfDebug(MachineBasicBlock::iterator I, MachineBasicBlock::iterator End) {
static MachineBasicBlock::const_iterator
nextIfDebug(MachineBasicBlock::const_iterator I,
MachineBasicBlock::const_iterator End) {
for(; I != End; ++I) {
if (!I->isDebugValue())
break;
@ -186,6 +187,18 @@ nextIfDebug(MachineBasicBlock::iterator I, MachineBasicBlock::iterator End) {
return I;
}
/// Non-const version.
static MachineBasicBlock::iterator
nextIfDebug(MachineBasicBlock::iterator I,
MachineBasicBlock::const_iterator End) {
// Cast the return value to nonconst MachineInstr, then cast to an
// instr_iterator, which does not check for null, finally return a
// bundle_iterator.
return MachineBasicBlock::instr_iterator(
const_cast<MachineInstr*>(
&*nextIfDebug(MachineBasicBlock::const_iterator(I), End)));
}
/// Top-level MachineScheduler pass driver.
///
/// Visit blocks in function order. Divide each block into scheduling regions
@ -565,10 +578,12 @@ void ScheduleDAGMI::updatePressureDiffs(ArrayRef<unsigned> LiveUses) {
// instruction's live-out.
const LiveInterval &LI = LIS->getInterval(Reg);
VNInfo *VNI;
if (BotRPTracker.getPos() == BB->end())
MachineBasicBlock::const_iterator I =
nextIfDebug(BotRPTracker.getPos(), BB->end());
if (I == BB->end())
VNI = LI.getVNInfoBefore(LIS->getMBBEndIdx(BB));
else {
LiveRangeQuery LRQ(LI, LIS->getInstructionIndex(BotRPTracker.getPos()));
LiveRangeQuery LRQ(LI, LIS->getInstructionIndex(I));
VNI = LRQ.valueIn();
}
// RegisterPressureTracker guarantees that readsReg is true for LiveUses.