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From: "sergos.gnu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/54717] [4.8 Regression] Runtime regression: polyhedron test "rnflow" degraded
Date: Mon, 08 Oct 2012 08:55:00 -0000	[thread overview]
Message-ID: <bug-54717-4-GkoXVALj4l@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54717-4@http.gcc.gnu.org/bugzilla/>


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54717

--- Comment #9 from Sergey Ostanevich <sergos.gnu at gmail dot com> 2012-10-08 08:55:25 UTC ---
Thanks for the reduced test, Dominique!

I see that vectorized did not manage to generate MIN after the change. Also, it
is looks pretty similar to what I posted at first: there was no prephitmp
created for the xxtrt_[]


> ival2_15 = _85 < prephitmp_266 ? ival2_10 : iva
> prephitmp_237 = MIN_EXPR <_85, prephitmp_266>;
-----------------------
< _86 = (integer(kind=8)) ival2_14;
< _87 = _86 + -1;
< _88 = *xxtrt_46(D)[_87];
< ival2_15 = _85 < _88 ? ival2_10 : ival2_14;

I suspect that one of the iterator you removed - possibly VEC_iterate - made
more traverse than that you created?

I also double check that for the reduced test MIN did not generated and not
appears in assembly. PMU measurements (Vtune) confirms that BBLOCKs missing min
contributes the difference in clocks.


  parent reply	other threads:[~2012-10-08  8:55 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-26 12:54 [Bug tree-optimization/54717] New: " sergos.gnu at gmail dot com
2012-09-26 13:17 ` [Bug tree-optimization/54717] " ubizjak at gmail dot com
2012-09-26 14:17 ` [Bug tree-optimization/54717] [4.8 Regression] " rguenth at gcc dot gnu.org
2012-09-26 15:12 ` sergos.gnu at gmail dot com
2012-09-26 15:41 ` dominiq at lps dot ens.fr
2012-09-26 20:07 ` sergos.gnu at gmail dot com
2012-09-27  9:28 ` rguenth at gcc dot gnu.org
2012-09-27 10:43 ` rguenth at gcc dot gnu.org
2012-10-02 20:24 ` dominiq at lps dot ens.fr
2012-10-08  8:55 ` sergos.gnu at gmail dot com [this message]
2012-11-13 18:40 ` ubizjak at gmail dot com
2012-11-13 18:54 ` dominiq at lps dot ens.fr
2012-11-14 18:56 ` sergos.gnu at gmail dot com
2012-11-14 19:42   ` Jan Hubicka
2012-11-14 19:43 ` hubicka at ucw dot cz
2012-11-14 20:11 ` hubicka at gcc dot gnu.org
2012-11-15 10:28 ` hubicka at gcc dot gnu.org
2012-11-15 10:52 ` hubicka at gcc dot gnu.org
2012-11-15 15:07 ` dominiq at lps dot ens.fr
2012-11-16 10:37 ` hubicka at gcc dot gnu.org
2012-12-06 16:51 ` rguenth at gcc dot gnu.org

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