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[Bug target/38306] [4.4 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures
- 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: 11 Feb 2009 19:25:07 -0000
- Subject: [Bug target/38306] [4.4 Regression] 15% slowdown w.r.t. 4.3 of computational kernel on some architectures
- References: <bug-38306-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from jv244 at cam dot ac dot uk 2009-02-11 19:25 -------
(In reply to comment #12)
> /* For -O2 and beyond, turn off -fschedule-insns by default. It tends to
> make the problem with not enough registers even worse. */
>
> As risky as this may be (for performance, not correctness), what about changing
> "if (level > 1)" to "if (level == 2)"? And what about enabling it on x86-64?
But even on x86-64 this seems to lead to ICEs (see PR38403).
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38306