Benjamin Kramer 654a85e2ee Sync the __builtin_expects for our 3 quadratically probed hash table implementations. ...

This assumes that
  a) finding the bucket containing the value is LIKELY
  b) finding an empty bucket is LIKELY
  c) growing the table is UNLIKELY

I also switched the a) and b) cases for SmallPtrSet as we seem to use
the set mostly more for insertion than for checking existence.

In a simple benchmark consisting of 2^21 insertions of 2^20 unique
pointers into a DenseMap or SmallPtrSet a few percent speedup on average,
but nothing statistically significant.

llvm-svn: 230232

2015-02-23 16:41:36 +00:00

8.6 KiB

Raw Blame History

View Raw