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From: "guenter at roeck-us dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/27287] [4.1/4.2 Regression] returning constant double
Date: Sat, 02 Sep 2006 13:23:00 -0000	[thread overview]
Message-ID: <20060902132324.23229.qmail@sourceware.org> (raw)
In-Reply-To: <bug-27287-11164@http.gcc.gnu.org/bugzilla/>



------- Comment #38 from guenter at roeck-us dot net  2006-09-02 13:23 -------
(In reply to comment #36)
> Subject: Re:  [4.1/4.2 Regression] returning constant double 
> 
>         What is confusing to me is that the r->r case is using evmergehi
> and evmergelo.  This is placing the value in both halves of the SIMD
> register.  It seems like this could have been done with two "mr".
> 
>         It is ambiguous whether the pattern is trying to load the full 64
> bit register or not.
> 
I think it is supposed to move the upper part of %1 to %0, and the lower part
of %1 to %L0. So it might be possible to replace it with
    evmergehi %0,%1,%1\;mr %L0,%1
(In reply to comment #36)
> Subject: Re:  [4.1/4.2 Regression] returning constant double 
> 
>         What is confusing to me is that the r->r case is using evmergehi
> and evmergelo.  This is placing the value in both halves of the SIMD
> register.  It seems like this could have been done with two "mr".
> 
>         It is ambiguous whether the pattern is trying to load the full 64
> bit register or not.
> 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27287


  parent reply	other threads:[~2006-09-02 13:23 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-24 15:58 [Bug c/27287] New: pukes eliot at sonic dot net
2006-04-24 15:59 ` [Bug c/27287] pukes eliot at sonic dot net
2006-04-24 16:20 ` [Bug target/27287] loading 0 constant causes an ICE (freescale's messy targets) pinskia at gcc dot gnu dot org
2006-04-25 16:44 ` eliot at sonic dot net
2006-07-08  2:29 ` [Bug target/27287] [4.1/4.2 Regression] returning constant double pinskia at gcc dot gnu dot org
2006-07-08  2:29 ` pinskia at gcc dot gnu dot org
2006-07-08  2:35 ` pinskia at gcc dot gnu dot org
2006-07-08  2:37 ` pinskia at gcc dot gnu dot org
2006-07-08  3:14 ` dje at gcc dot gnu dot org
2006-07-13 16:08 ` edmar at freescale dot com
2006-07-13 16:31 ` dje at watson dot ibm dot com
2006-07-13 18:01 ` edmar at freescale dot com
2006-07-13 19:58 ` dje at watson dot ibm dot com
2006-07-13 20:09 ` edmar at freescale dot com
2006-07-13 20:36 ` dje at watson dot ibm dot com
2006-07-13 20:48 ` edmar at freescale dot com
2006-07-14 17:19 ` edmar at freescale dot com
2006-07-14 17:44 ` dje at gcc dot gnu dot org
2006-07-14 17:47 ` [Bug target/27287] [4.1 " dje at gcc dot gnu dot org
2006-07-26 20:23 ` dje at gcc dot gnu dot org
2006-07-26 20:26 ` dje at gcc dot gnu dot org
2006-08-29 19:12 ` guenter at roeck-us dot net
2006-08-29 19:26 ` dje at watson dot ibm dot com
2006-08-29 20:23 ` guenter at roeck-us dot net
2006-08-29 20:49 ` dje at gcc dot gnu dot org
2006-08-29 20:51 ` [Bug target/27287] [4.1/4.2 " pinskia at gcc dot gnu dot org
2006-08-29 21:09 ` dje at gcc dot gnu dot org
2006-08-30 15:16 ` guenter at roeck-us dot net
2006-08-30 18:00 ` guenter at roeck-us dot net
2006-08-30 18:08 ` dje at watson dot ibm dot com
2006-08-30 18:42 ` dje at watson dot ibm dot com
2006-08-30 20:40 ` guenter at roeck-us dot net
2006-08-31  2:36 ` dje at gcc dot gnu dot org
2006-08-31  5:15 ` guenter at roeck-us dot net
2006-08-31 13:50 ` dje at watson dot ibm dot com
2006-08-31 14:24 ` dje at watson dot ibm dot com
2006-09-01 19:56 ` dje at watson dot ibm dot com
2006-09-01 21:25 ` mmitchel at gcc dot gnu dot org
2006-09-02 13:23 ` guenter at roeck-us dot net [this message]
2006-09-11 17:05 ` dje at gcc dot gnu dot org
2006-09-13  5:25 ` [Bug target/27287] [4.1 " pinskia at gcc dot gnu dot org
2006-10-05 15:18 ` dje at gcc dot gnu dot org
2006-10-05 15:47 ` pinskia at gcc dot gnu dot org

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