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TableGen'd regpressure: register unit set pruning.

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The pruning is more complete if it is not done incrementally. The code
is also a tad less convluted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154510 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2012-04-11 17:35:26 +00:00
parent 6073b30b05
commit 5c1761d486
1 changed files with 14 additions and 18 deletions
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32
utils/TableGen/CodeGenRegisters.cpp
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@ -1167,8 +1167,7 @@ void CodeGenRegBank::pruneUnitSets() {
assert(RegClassUnitSets.empty() && "this invalidates RegClassUnitSets");
// Form an equivalence class of UnitSets with no significant difference.
// Populate PrunedUnitSets with each equivalence class's superset.
std::vector<RegUnitSet> PrunedUnitSets;
std::vector<unsigned> SuperSetIDs;
for (unsigned SubIdx = 0, EndIdx = RegUnitSets.size();
SubIdx != EndIdx; ++SubIdx) {
const RegUnitSet &SubSet = RegUnitSets[SubIdx];
@ -1176,25 +1175,22 @@ void CodeGenRegBank::pruneUnitSets() {
for (; SuperIdx != EndIdx; ++SuperIdx) {
if (SuperIdx == SubIdx)
continue;
const RegUnitSet *SuperSet = 0;
if (SuperIdx > SubIdx)
SuperSet = &RegUnitSets[SuperIdx];
else {
// Compare with already-pruned sets.
if (SuperIdx >= PrunedUnitSets.size())
continue;
SuperSet = &PrunedUnitSets[SuperIdx];
}
if (isRegUnitSubSet(SubSet.Units, SuperSet->Units)
&& (SubSet.Units.size() + 3 > SuperSet->Units.size())) {
const RegUnitSet &SuperSet = RegUnitSets[SuperIdx];
if (isRegUnitSubSet(SubSet.Units, SuperSet.Units)
&& (SubSet.Units.size() + 3 > SuperSet.Units.size())) {
break;
}
}
if (SuperIdx != EndIdx)
continue;
PrunedUnitSets.resize(PrunedUnitSets.size()+1);
PrunedUnitSets.back().Name = RegUnitSets[SubIdx].Name;
PrunedUnitSets.back().Units.swap(RegUnitSets[SubIdx].Units);
if (SuperIdx == EndIdx)
SuperSetIDs.push_back(SubIdx);
}
// Populate PrunedUnitSets with each equivalence class's superset.
std::vector<RegUnitSet> PrunedUnitSets(SuperSetIDs.size());
for (unsigned i = 0, e = SuperSetIDs.size(); i != e; ++i) {
unsigned SuperIdx = SuperSetIDs[i];
PrunedUnitSets[i].Name = RegUnitSets[SuperIdx].Name;
PrunedUnitSets[i].Units.swap(RegUnitSets[SuperIdx].Units);
}
RegUnitSets.swap(PrunedUnitSets);
}