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[Bug other/25674] better optimization of builtin_popcountl (avoid iterations and lookup table).
- From: "falk at debian dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Jan 2006 22:39:24 -0000
- Subject: [Bug other/25674] better optimization of builtin_popcountl (avoid iterations and lookup table).
- References: <bug-25674-7667@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from falk at debian dot org 2006-01-04 22:39 -------
Actually, using a table is faster when the cache is hot (about 15%).
The problem is that libgcc doesn't unroll the loop.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25674