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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/37194] Autovectorization of small constant iteration loop degrades performance Date: Thu, 21 Aug 2008 19:33:00 -0000 [thread overview] Message-ID: <20080821193201.1485.qmail@sourceware.org> (raw) In-Reply-To: <bug-37194-14936@http.gcc.gnu.org/bugzilla/> ------- Comment #1 from pinskia at gcc dot gnu dot org 2008-08-21 19:32 ------- Confirmed, this is true for the Cell too. In fact is bad for the cell because of: stfs 1,16(1) cmpwi 7,0,0 li 0,16 slwi 9,9,2 li 11,0 add 9,3,9 lvewx 0,1,0 vspltw 0,0,0 The store is not 40-50 cycles before the load so we have a LHS. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |pinskia at gcc dot gnu dot | |org Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 GCC build triplet|powerpc64-linux | GCC host triplet|powerpc64-linux | Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2008-08-21 19:32:00 date| | Summary|Autovectorization of |Autovectorization of small |constant iteration loop |constant iteration loop |degrades performance |degrades performance http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37194
next prev parent reply other threads:[~2008-08-21 19:33 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-08-21 19:23 [Bug tree-optimization/37194] New: Autovectorization of " pthaugen at gcc dot gnu dot org 2008-08-21 19:33 ` pinskia at gcc dot gnu dot org [this message] 2008-08-22 9:54 ` [Bug tree-optimization/37194] Autovectorization of small " rguenth at gcc dot gnu dot org 2008-08-22 13:33 ` dorit at gcc dot gnu dot org 2008-12-27 5:55 ` pinskia at gcc dot gnu dot org 2008-12-27 5:58 ` [Bug tree-optimization/37194] [4.3/4.4 Regression] " pinskia at gcc dot gnu dot org 2008-12-29 21:58 ` rguenth at gcc dot gnu dot org 2008-12-30 14:58 ` irar at il dot ibm dot com 2009-01-05 13:58 ` irar at il dot ibm dot com 2009-01-08 8:00 ` irar at gcc dot gnu dot org 2009-01-08 9:23 ` jakub at gcc dot gnu dot org 2009-01-08 9:24 ` cnstar9988 at gmail dot com 2009-01-08 9:26 ` irar at il dot ibm dot com 2009-01-11 7:55 ` [Bug tree-optimization/37194] [4.3 " irar at gcc dot gnu dot org 2009-01-11 7:57 ` irar at il dot ibm dot com
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