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Clean up the Spiller.h interface.

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The earliestStart argument is entirely specific to linear scan allocation, and
can be easily calculated by RegAllocLinearScan.

Replace std::vector with SmallVector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111055 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-08-13 22:56:53 +00:00
parent 703af3ab12
commit 0a2b2a1497
6 changed files with 31 additions and 44 deletions
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17
lib/CodeGen/RegAllocLinearScan.cpp
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@ -1202,8 +1202,7 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
// linearscan.
if (cur->weight != HUGE_VALF && cur->weight <= minWeight) {
DEBUG(dbgs() << "\t\t\tspilling(c): " << *cur << '\n');
SmallVector<LiveInterval*, 8> spillIs;
std::vector<LiveInterval*> added;
SmallVector<LiveInterval*, 8> spillIs, added;
spiller_->spill(cur, added, spillIs);
std::sort(added.begin(), added.end(), LISorter());
@ -1268,25 +1267,31 @@ void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
// in handled we need to roll back
assert(!spillIs.empty() && "No spill intervals?");
SlotIndex earliestStart = spillIs[0]->beginIndex();
// Spill live intervals of virtual regs mapped to the physical register we
// want to clear (and its aliases). We only spill those that overlap with the
// current interval as the rest do not affect its allocation. we also keep
// track of the earliest start of all spilled live intervals since this will
// mark our rollback point.
std::vector<LiveInterval*> added;
SmallVector<LiveInterval*, 8> added;
while (!spillIs.empty()) {
LiveInterval *sli = spillIs.back();
spillIs.pop_back();
DEBUG(dbgs() << "\t\t\tspilling(a): " << *sli << '\n');
if (sli->beginIndex() < earliestStart)
earliestStart = sli->beginIndex();
spiller_->spill(sli, added, spillIs, &earliestStart);
spiller_->spill(sli, added, spillIs);
addStackInterval(sli, ls_, li_, mri_, *vrm_);
spilled.insert(sli->reg);
}
// Include any added intervals in earliestStart.
for (unsigned i = 0, e = added.size(); i != e; ++i) {
SlotIndex SI = added[i]->beginIndex();
if (SI < earliestStart)
earliestStart = SI;
}
DEBUG(dbgs() << "\t\trolling back to: " << earliestStart << '\n');
// Scan handled in reverse order up to the earliest start of a