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[Bug target/38306] [4.4 Regression] 15% slowdown of computational kernel
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Nov 2008 16:26:02 -0000
- Subject: [Bug target/38306] [4.4 Regression] 15% slowdown of computational kernel
- References: <bug-38306-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from jv244 at cam dot ac dot uk 2008-11-30 16:26 -------
(In reply to comment #4)
> 4.3:
> -O3 -march=native -funroll-loops -ffast-math ==> 4.376
> -O3 -march=native -funroll-loops -ffast-math -fschedule-insns ==> 3.372
strangely:
http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Optimize-Options.html#Optimize-Options
suggests -fschedule-insns is enabled by default at -O3 ?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38306