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Avoid moving iterators when the previous block was just visited.

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llvm-svn: 129081
This commit is contained in:
Jakob Stoklund Olesen 2011-04-07 17:27:50 +00:00
parent 1791098020
commit aace1636b6
1 changed files with 13 additions and 8 deletions
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21
lib/CodeGen/InterferenceCache.cpp
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@ -99,13 +99,15 @@ void InterferenceCache::Entry::update(unsigned MBBNum) {
tie(Start, Stop) = Indexes->getMBBRange(MBBNum);
// Use advanceTo only when possible.
if (!PrevPos.isValid() || Start < PrevPos)
for (unsigned i = 0, e = Iters.size(); i != e; ++i)
Iters[i].find(Start);
else
for (unsigned i = 0, e = Iters.size(); i != e; ++i)
Iters[i].advanceTo(Start);
PrevPos = Start;
if (PrevPos != Start) {
if (!PrevPos.isValid() || Start < PrevPos)
for (unsigned i = 0, e = Iters.size(); i != e; ++i)
Iters[i].find(Start);
else
for (unsigned i = 0, e = Iters.size(); i != e; ++i)
Iters[i].advanceTo(Start);
PrevPos = Start;
}
// Check for first interference.
for (unsigned i = 0, e = Iters.size(); i != e; ++i) {
@ -129,11 +131,14 @@ void InterferenceCache::Entry::update(unsigned MBBNum) {
if (!I.valid() || I.start() >= Stop)
continue;
I.advanceTo(Stop);
if (!I.valid() || I.start() >= Stop)
bool Backup = !I.valid() || I.start() >= Stop;
if (Backup)
--I;
SlotIndex StopI = I.stop();
if (!BI->Last.isValid() || StopI > BI->Last)
BI->Last = StopI;
if (Backup)
++I;
}
PrevPos = Stop;
}