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tablegen: Add a simple heuristic to get better names for pressure sets

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Differential Revision: http://reviews.llvm.org/D14597

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253095 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2015-11-13 22:30:27 +00:00
parent 2588aa9425
commit ca7d645a60
1 changed files with 6 additions and 0 deletions
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6
utils/TableGen/CodeGenRegisters.cpp
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@ -1574,6 +1574,12 @@ void CodeGenRegBank::pruneUnitSets() {
&& UnitWeight == RegUnits[SuperSet.Units.back()].Weight) {
DEBUG(dbgs() << "UnitSet " << SubIdx << " subsumed by " << SuperIdx
<< "\n");
// We can pick any of the set names for the merged set. Go for the
// shortest one to avoid picking the name of one of the classes that are
// artificially created by tablegen. So "FPR128_lo" instead of
// "QQQQ_with_qsub3_in_FPR128_lo".
if (RegUnitSets[SubIdx].Name.size() < RegUnitSets[SuperIdx].Name.size())
RegUnitSets[SuperIdx].Name = RegUnitSets[SubIdx].Name;
break;
}
}