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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/54027] [4.8 Regression] possible mis-optimization of signed left shift in c89 mode
Date: Fri, 10 Aug 2012 08:34:00 -0000	[thread overview]
Message-ID: <bug-54027-4-c3iPEEb6Ke@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-54027-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54027

--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-08-10 08:34:01 UTC ---
Author: rguenth
Date: Fri Aug 10 08:33:57 2012
New Revision: 190286

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=190286
Log:
2012-08-10  Richard Guenther  <rguenther@suse.de>

    PR tree-optimization/54027
    * tree-vrp.c (extract_range_from_binary_expr_1): Merge RSHIFT_EXPR
    and LSHIFT_EXPR handling, force -fwrapv for the multiplication used
    to handle LSHIFT_EXPR with a constant.

    * gcc.dg/torture/pr54027.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr54027.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vrp.c


  parent reply	other threads:[~2012-08-10  8:34 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-19  4:24 [Bug c/54027] New: " regehr at cs dot utah.edu
2012-07-19 10:07 ` [Bug c/54027] " rguenth at gcc dot gnu.org
2012-07-19 15:08 ` joseph at codesourcery dot com
2012-07-20  9:38 ` [Bug tree-optimization/54027] [4.8 Regression] " rguenth at gcc dot gnu.org
2012-08-09 13:31 ` markus at trippelsdorf dot de
2012-08-10  8:34 ` rguenth at gcc dot gnu.org [this message]
2012-08-10  8:39 ` rguenth at gcc dot gnu.org

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