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From: "tocarip.intel at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/50038] redundant zero extensions Date: Tue, 27 Sep 2011 11:08:00 -0000 [thread overview] Message-ID: <bug-50038-4-dr8uQc93K7@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-50038-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50038 --- Comment #2 from tocarip.intel at gmail dot com 2011-09-27 10:15:15 UTC --- Created attachment 25369 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25369 Possible solution Here is an experimental patch which solves this problem. I modified implicit-zee pass to also eliminate useless zero-extensions from QImode to SImode. With this patch rgbyiqv test from EEMBC 2.0 benchmark showed 6% improvement. However after this patch implicit-zee may became useful for additional targets. For example it became beneficial to 32-bit x86 (+4% on rgbyiqv). Here is a Changelog: 2011-09-27 Ilya Tocar <ilya.tocar@intel.com> * implicit-zee.c: Added 2011 to copyright. (combine_set_zero_extend): Add QImode. (merge_def_and_ze): Likewise. (add_removable_zero_extend): Likewise. (not_qi_to_si): New. (make_defs_and_copies_lists): Add check for QImode.
next prev parent reply other threads:[~2011-09-27 10:15 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-08-10 15:43 [Bug target/50038] New: " tocarip.intel at gmail dot com 2011-08-11 10:47 ` [Bug target/50038] " izamyatin at gmail dot com 2011-09-27 11:08 ` tocarip.intel at gmail dot com [this message] 2011-09-30 15:01 ` tocarip.intel at gmail dot com 2011-10-03 9:19 ` ubizjak at gmail dot com 2011-10-04 9:52 ` tocarip.intel at gmail dot com 2011-10-04 10:04 ` ubizjak at gmail dot com 2011-11-05 10:56 ` ebotcazou at gcc dot gnu.org 2011-12-21 11:54 ` kyukhin at gcc dot gnu.org 2011-12-28 9:16 ` ubizjak at gmail dot com
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