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tablegen: Add a simple heuristic to get better names for pressure sets
Differential Revision: http://reviews.llvm.org/D14597 llvm-svn: 253095
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@ -1574,6 +1574,12 @@ void CodeGenRegBank::pruneUnitSets() {
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&& UnitWeight == RegUnits[SuperSet.Units.back()].Weight) {
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DEBUG(dbgs() << "UnitSet " << SubIdx << " subsumed by " << SuperIdx
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<< "\n");
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// We can pick any of the set names for the merged set. Go for the
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// shortest one to avoid picking the name of one of the classes that are
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// artificially created by tablegen. So "FPR128_lo" instead of
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// "QQQQ_with_qsub3_in_FPR128_lo".
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if (RegUnitSets[SubIdx].Name.size() < RegUnitSets[SuperIdx].Name.size())
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RegUnitSets[SuperIdx].Name = RegUnitSets[SubIdx].Name;
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break;
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}
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}
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