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Cache MBB->begin. It's possible the scheduler / bundler may change MBB->begin().

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2012-03-09 00:24:29 +00:00
parent cdaedf9f4a
commit 9ad62b3c09
1 changed files with 3 additions and 3 deletions
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6
lib/CodeGen/MachineScheduler.cpp
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@ -128,13 +128,13 @@ bool MachineScheduler::runOnMachineFunction(MachineFunction &mf) {
// Break the block into scheduling regions [I, RegionEnd), and schedule each
// region as soon as it is discovered.
unsigned RemainingCount = MBB->size();
for(MachineBasicBlock::iterator RegionEnd = MBB->end();
RegionEnd != MBB->begin();) {
for(MachineBasicBlock::iterator RegionEnd = MBB->end(),
RegionStart = MBB->begin(); RegionEnd != RegionStart;) {
Scheduler->startBlock(MBB);
// The next region starts above the previous region. Look backward in the
// instruction stream until we find the nearest boundary.
MachineBasicBlock::iterator I = RegionEnd;
for(;I != MBB->begin(); --I, --RemainingCount) {
for(;I != RegionStart; --I, --RemainingCount) {
if (TII->isSchedulingBoundary(llvm::prior(I), MBB, *MF))
break;
}