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From: "bonzini at gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/30904] [dataflow] No longer optimizes shifts with large count
Date: Wed, 21 Feb 2007 16:11:00 -0000 [thread overview]
Message-ID: <20070221161144.23822.qmail@sourceware.org> (raw)
In-Reply-To: <bug-30904-10053@http.gcc.gnu.org/bugzilla/>
------- Comment #5 from bonzini at gnu dot org 2007-02-21 16:11 -------
The first one is in the same EBB as the assignment. The second one isn't and
combine screws up. This is because of the way combine treats regs with one def
that dominates all uses, I talked to zadeck yesterday about that on IRC.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30904
next prev parent reply other threads:[~2007-02-21 16:11 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 9:54 [Bug middle-end/30904] New: " rguenth at gcc dot gnu dot org
2007-02-21 13:31 ` [Bug middle-end/30904] " belyshev at depni dot sinp dot msu dot ru
2007-02-21 15:58 ` steven at gcc dot gnu dot org
2007-02-21 16:03 ` bonzini at gnu dot org
2007-02-21 16:05 ` bonzini at gnu dot org
2007-02-21 16:11 ` bonzini at gnu dot org [this message]
2007-02-21 16:24 ` bonzini at gnu dot org
2007-02-22 8:41 ` [Bug tree-optimization/30904] VRP does not track values of shifts and/or bitfields? bonzini at gnu dot org
2007-02-24 16:08 ` bonzini at gcc dot gnu dot org
2007-03-09 12:29 ` rguenth at gcc dot gnu dot org
2007-03-09 12:29 ` rguenth at gcc dot gnu dot org
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