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Use the precomputed def presence in RAGreedy::calcSpillCost.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136742 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-08-02 23:04:08 +00:00
parent 5ebca793db
commit 3f5beede1b
1 changed files with 2 additions and 11 deletions
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13
lib/CodeGen/RegAllocGreedy.cpp
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@ -864,7 +864,6 @@ bool RAGreedy::calcCompactRegion(GlobalSplitCandidate &Cand) {
/// SA around all use blocks instead of forming bundle regions.
float RAGreedy::calcSpillCost() {
float Cost = 0;
const LiveInterval &LI = SA->getParent();
ArrayRef<SplitAnalysis::BlockInfo> UseBlocks = SA->getUseBlocks();
for (unsigned i = 0; i != UseBlocks.size(); ++i) {
const SplitAnalysis::BlockInfo &BI = UseBlocks[i];
@ -873,16 +872,8 @@ float RAGreedy::calcSpillCost() {
Cost += SpillPlacer->getBlockFrequency(Number);
// Unless the value is redefined in the block.
if (BI.LiveIn && BI.LiveOut) {
SlotIndex Start, Stop;
tie(Start, Stop) = Indexes->getMBBRange(Number);
LiveInterval::const_iterator I = LI.find(Start);
assert(I != LI.end() && "Expected live-in value");
// Is there a different live-out value? If so, we need an extra spill
// instruction.
if (I->end < Stop)
Cost += SpillPlacer->getBlockFrequency(Number);
}
if (BI.LiveIn && BI.LiveOut && BI.FirstDef)
Cost += SpillPlacer->getBlockFrequency(Number);
}
return Cost;
}