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Build the Hopfield network incrementally when splitting global live ranges.

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It is common for large live ranges to have few basic blocks with register uses
and many live-through blocks without any uses. This approach grows the Hopfield
network incrementally around the use blocks, completely avoiding checking
interference for some through blocks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129188 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-04-09 02:59:09 +00:00
parent 9d29cbad32
commit f4afdfc501
7 changed files with 183 additions and 84 deletions
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11
lib/CodeGen/SplitKit.cpp
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@ -132,12 +132,14 @@ void SplitAnalysis::analyzeUses() {
DEBUG(dbgs() << "Analyze counted "
<< UseSlots.size() << " instrs in "
<< UseBlocks.size() << " blocks, through "
<< ThroughBlocks.size() << " blocks.\n");
<< NumThroughBlocks << " blocks.\n");
}
/// calcLiveBlockInfo - Fill the LiveBlocks array with information about blocks
/// where CurLI is live.
bool SplitAnalysis::calcLiveBlockInfo() {
ThroughBlocks.resize(MF.getNumBlockIDs());
NumThroughBlocks = 0;
if (CurLI->empty())
return true;
@ -193,9 +195,10 @@ bool SplitAnalysis::calcLiveBlockInfo() {
BI.LiveThrough = !hasGap && BI.LiveIn && BI.LiveOut;
if (Uses)
UseBlocks.push_back(BI);
else
ThroughBlocks.push_back(BI.MBB->getNumber());
else {
++NumThroughBlocks;
ThroughBlocks.set(BI.MBB->getNumber());
}
// FIXME: This should never happen. The live range stops or starts without a
// corresponding use. An earlier pass did something wrong.
if (!BI.LiveThrough && !Uses)