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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/43716] [4.6/4.7/4.8 Regression] Revision 158105 miscompiles doduc.f90
Date: Sat, 21 Jul 2012 11:31:00 -0000	[thread overview]
Message-ID: <bug-43716-4-wndT8F2LjA@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-43716-4@http.gcc.gnu.org/bugzilla/>

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43716

--- Comment #33 from Uros Bizjak <ubizjak at gmail dot com> 2012-07-21 11:31:18 UTC ---
The NaN is generated as a mask for DFmode ABS_EXPR:

(insn 124 123 125 (set (reg:V2DF 508)
        (mem/u/c:V2DF (symbol_ref/u:DI ("*.LC13") [flags 0x2]) [5 S16 A128]))
doduc.f90:5376 -1
     (expr_list:REG_EQUAL (const_vector:V2DF [
                (const_double:DF +QNaN [+QNaN])
                (const_double:DF 0.0 [0x0.0p+0])
            ])
        (nil)))

or V2DFmode ABS_EXPR:

(insn 1648 1647 1649 (set (reg:V2DF 4657)
        (mem/u/c:V2DF (symbol_ref/u:DI ("*.LC138") [flags 0x2]) [5 S16 A128]))
doduc.f90:1851 -1
     (expr_list:REG_EQUAL (const_vector:V2DF [
                (const_double:DF +QNaN [+QNaN])
                (const_double:DF +QNaN [+QNaN])
            ])
        (nil)))

Probably, some mixup happens somewhere in RTL optimization passes.


  parent reply	other threads:[~2012-07-21 11:31 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <bug-43716-4@http.gcc.gnu.org/bugzilla/>
2012-07-21 10:42 ` ubizjak at gmail dot com
2012-07-21 10:45 ` ubizjak at gmail dot com
2012-07-21 10:49 ` ubizjak at gmail dot com
2012-07-21 11:31 ` ubizjak at gmail dot com [this message]
2012-07-21 12:17 ` ubizjak at gmail dot com
2012-07-21 12:35 ` ubizjak at gmail dot com
2012-07-21 13:40 ` dominiq at lps dot ens.fr
2012-07-21 13:52 ` ubizjak at gmail dot com
2012-07-21 14:43 ` dominiq at lps dot ens.fr
2012-07-22 10:48 ` dominiq at lps dot ens.fr
2012-07-23  8:13 ` rguenth at gcc dot gnu.org
2012-12-07  9:21 ` rguenth at gcc dot gnu.org
2012-12-07 13:40 ` dominiq at lps dot ens.fr
2012-12-07 14:29 ` rguenth at gcc dot gnu.org
2012-12-18  9:14 ` jakub at gcc dot gnu.org
2012-12-18 10:24 ` jakub at gcc dot gnu.org
2013-01-08 18:26 ` dominiq at lps dot ens.fr
2013-01-08 19:24 ` ubizjak at gmail dot com
2013-01-08 19:53 ` dominiq at lps dot ens.fr
2013-01-09  8:52 ` richard.guenther at gmail dot com

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