[llvm] r340020 - [TableGen] TypeSetByHwMode::insert - cache the default MVT. NFCI.
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Fri Aug 17 06:03:17 PDT 2018
Author: rksimon
Date: Fri Aug 17 06:03:17 2018
New Revision: 340020
URL: http://llvm.org/viewvc/llvm-project?rev=340020&view=rev
Log:
[TableGen] TypeSetByHwMode::insert - cache the default MVT. NFCI.
Avoids repeated count()/find() calls that we've already have the default values for.
Modified:
llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp
Modified: llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp?rev=340020&r1=340019&r2=340020&view=diff
==============================================================================
--- llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp (original)
+++ llvm/trunk/utils/TableGen/CodeGenDAGPatterns.cpp Fri Aug 17 06:03:17 2018
@@ -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;
}
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