From: Richard Henderson <rth@redhat.com>
To: Corey Minyard <minyard@acm.org>
Cc: gcc@gcc.gnu.org
Subject: Re: Loop optimization bug with Ada front end on PPC (and probably Alpha)
Date: Thu, 15 Nov 2001 19:37:00 -0000 [thread overview]
Message-ID: <20011125155048.A11429@redhat.com> (raw)
In-Reply-To: <3C0179C5.2090002@acm.org>; from minyard@acm.org on Sun, Nov 25, 2001 at 05:07:49PM -0600
On Sun, Nov 25, 2001 at 05:07:49PM -0600, Corey Minyard wrote:
> Unfortunately, it's not simple to reproduce this, since you have to
> build an Ada cross compiler, and you have to compile this code as part
> of the compiler (since you can't compile anything else easily without
> having gnatlib compiled and installed) And it's not the same as the one
> reported by Andreas Schwab; I don't think you can reproduce this
> particular bug with the C compiler. You have to jump past the increment
> to enter the loop, but the jump has to be after the loop begin note.
No, this appears to be exactly the same bug that Andreas demonstrates.
The reason being that it's GCSE that transforms the rtl to have the jump
after the loop begin note.
I'll look at your patch in a minute. In the future, _always_ include
the -p option to diff.
r~
WARNING: multiple messages have this Message-ID
From: Richard Henderson <rth@redhat.com>
To: Corey Minyard <minyard@acm.org>
Cc: gcc@gcc.gnu.org
Subject: Re: Loop optimization bug with Ada front end on PPC (and probably Alpha)
Date: Sun, 25 Nov 2001 15:52:00 -0000 [thread overview]
Message-ID: <20011125155048.A11429@redhat.com> (raw)
Message-ID: <20011125155200.7G1ChwItRPzJDOoVFcX99f74TNntix93Kx8PVSAb_y0@z> (raw)
In-Reply-To: <3C0179C5.2090002@acm.org>
On Sun, Nov 25, 2001 at 05:07:49PM -0600, Corey Minyard wrote:
> Unfortunately, it's not simple to reproduce this, since you have to
> build an Ada cross compiler, and you have to compile this code as part
> of the compiler (since you can't compile anything else easily without
> having gnatlib compiled and installed) And it's not the same as the one
> reported by Andreas Schwab; I don't think you can reproduce this
> particular bug with the C compiler. You have to jump past the increment
> to enter the loop, but the jump has to be after the loop begin note.
No, this appears to be exactly the same bug that Andreas demonstrates.
The reason being that it's GCSE that transforms the rtl to have the jump
after the loop begin note.
I'll look at your patch in a minute. In the future, _always_ include
the -p option to diff.
r~
next prev parent reply other threads:[~2001-11-25 23:52 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-13 5:20 Corey Minyard
2001-11-13 6:05 ` David Edelsohn
2001-11-14 8:05 ` Corey Minyard
2001-11-13 8:02 ` guerby
2001-11-13 9:48 ` Corey Minyard
2001-11-16 22:19 ` David Edelsohn
2001-11-26 7:39 ` David Edelsohn
2001-11-15 0:48 ` Richard Henderson
2001-11-15 14:19 ` Andreas Schwab
2001-11-15 16:20 ` Richard Henderson
2001-11-25 12:23 ` Richard Henderson
2001-11-18 9:18 ` Richard Henderson
2001-11-27 0:02 ` Richard Henderson
2001-11-25 8:57 ` Andreas Schwab
2001-11-15 18:02 ` Corey Minyard
2001-11-15 19:37 ` Richard Henderson [this message]
2001-11-25 15:52 ` Richard Henderson
2001-11-16 3:13 ` Richard Henderson
2001-11-16 3:42 ` Corey Minyard
2001-11-16 8:54 ` Bryce McKinlay
2001-11-26 0:47 ` Bryce McKinlay
2001-11-25 20:27 ` Corey Minyard
2001-11-17 1:33 ` Corey Minyard
2001-11-17 6:09 ` Corey Minyard
2001-11-26 10:22 ` Corey Minyard
2001-11-17 11:51 ` Richard Henderson
2001-11-17 15:20 ` Corey Minyard
2001-11-26 14:45 ` Corey Minyard
2001-11-18 5:15 ` Corey Minyard
2001-11-18 8:59 ` Richard Henderson
2001-11-19 2:58 ` Corey Minyard
2001-11-19 3:11 ` Richard Henderson
2001-11-19 5:36 ` Corey Minyard
2001-11-19 7:48 ` Richard Henderson
2001-11-19 7:58 ` Corey Minyard
2001-11-19 9:43 ` Richard Henderson
2001-11-19 12:44 ` Corey Minyard
2001-11-19 13:53 ` Richard Henderson
2001-11-20 11:20 ` Corey Minyard
2001-11-27 19:57 ` Corey Minyard
2001-11-27 15:31 ` Richard Henderson
2001-11-27 15:04 ` Corey Minyard
2001-11-27 14:27 ` Richard Henderson
2001-11-27 13:25 ` Corey Minyard
2001-11-27 12:58 ` Richard Henderson
2001-11-27 11:51 ` Corey Minyard
2001-11-27 10:29 ` Richard Henderson
2001-11-27 10:08 ` Corey Minyard
2001-11-26 23:18 ` Richard Henderson
2001-11-26 17:15 ` Corey Minyard
2001-11-26 13:49 ` Richard Henderson
2001-11-26 8:58 ` Corey Minyard
2001-11-25 17:58 ` Richard Henderson
2001-11-25 15:06 ` Corey Minyard
2001-11-15 18:47 Richard Kenner
2001-11-25 15:13 ` Richard Kenner
2001-11-15 19:05 dewar
2001-11-25 15:20 ` dewar
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