Nikita Popov cbaae61422 [DebugInstrRef] Use DenseMap for ValueToLoc (NFC) ...

Just replacing std::map with DenseMap here is a major regression
-- because this code used an identity hash for ValueIDNum.
Because ValueIDNum is composed of multiple components, it is
important that we use a reasonably good hash function here, so
switch it to hash_value. DenseMapInfo::getHashValue<uint64_t>
would not be sufficient.

This gives a -0.8% geomean improvement on CTMark ReleaseLTO-g.

2022-01-18 17:02:14 +01:00

132 KiB

Raw Blame History

View Raw