[Bug c++/50495] Optimize exact matches in overload resolution

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50495

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-09-23
     Ever Confirmed|0                           |1

--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-23 15:58:12 UTC ---
I recently made a number of improvements that will be in 4.7.0; see PR 48481.

It certainly would be possible to do more optimization:
1) Once we have seen a valid exact match, quickly disqualify any later
candidates that are not.
2) Try to find that exact match faster with a hash or splay tree lookup.

#2 would only be useful for large overload sets, but #1 could be a minor
optimization for all code.