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[TableGen] TypeSetByHwMode::insert - cache the default MVT. NFCI. 

Avoids repeated count()/find() calls that we've already have the default values for.

llvm-svn: 340020
This commit is contained in:
Simon Pilgrim 2018-08-17 13:03:17 +00:00
parent 0ac44c18b7
commit 16a2f54eee
1 changed files with 10 additions and 3 deletions
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13
llvm/utils/TableGen/CodeGenDAGPatterns.cpp
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@ -99,22 +99,29 @@ bool TypeSetByHwMode::isPossible() const {
bool TypeSetByHwMode::insert(const ValueTypeByHwMode &VVT) {
bool Changed = false;
bool ContainsDefault = false;
MVT DT = MVT::Other;
SmallDenseSet<unsigned, 4> Modes;
for (const auto &P : VVT) {
unsigned M = P.first;
Modes.insert(M);
// Make sure there exists a set for each specific mode from VVT.
Changed |= getOrCreate(M).insert(P.second).second;
// Cache VVT's default mode.
if (DefaultMode == M) {
ContainsDefault = true;
DT = P.second;
}
}
// If VVT has a default mode, add the corresponding type to all
// modes in "this" that do not exist in VVT.
if (Modes.count(DefaultMode)) {
MVT DT = VVT.getType(DefaultMode);
if (ContainsDefault)
for (auto &I : *this)
if (!Modes.count(I.first))
Changed |= I.second.insert(DT).second;
}
return Changed;
}