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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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15
lib/CodeGen/EdgeBundles.cpp
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@ -53,6 +53,19 @@ bool EdgeBundles::runOnMachineFunction(MachineFunction &mf) {
EC.compress();
if (ViewEdgeBundles)
view();
// Compute the reverse mapping.
Blocks.clear();
Blocks.resize(getNumBundles());
for (unsigned i = 0, e = MF->getNumBlockIDs(); i != e; ++i) {
unsigned b0 = getBundle(i, 0);
unsigned b1 = getBundle(i, 1);
Blocks[b0].push_back(i);
if (b1 != b0)
Blocks[b1].push_back(i);
}
return false;
}
@ -82,5 +95,3 @@ raw_ostream &llvm::WriteGraph(raw_ostream &O, const EdgeBundles &G,
O << "}\n";
return O;
}