From: law@redhat.com
To: David Edelsohn <dje@watson.ibm.com>
Cc: gcc@gcc.gnu.org
Subject: Re: Load hoisting bug
Date: Fri, 07 Dec 2001 16:49:00 -0000 [thread overview]
Message-ID: <4453.1007770588@porcupine.cygnus.com> (raw)
In-Reply-To: Your message of Fri, 07 Dec 2001 19:00:56 EST. <200112080000.TAA22812@makai.watson.ibm.com>
> We have not had enough fun with loop optimizations lately, so I
> found one...
>
> The divconst-3.c regression on AIX which appeared at the beginning
> of November is due to GCC miscompiling itself. The miscompilation is
> caused by a loop optimization which was not safe.
[ ... ]
Note that the handling of hard registers in loops changed in early November.
I believe this is the patch:
* loop.c (loop_regs_scan): Don't invalidate PIC register.
You might try without that patch and see if this problem goes away.
jeff
next prev parent reply other threads:[~2001-12-08 0:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-07 16:01 David Edelsohn
2001-12-07 16:49 ` law [this message]
2001-12-07 16:50 ` Richard Henderson
2001-12-13 10:42 ` David Edelsohn
2001-12-13 13:26 ` Richard Henderson
2001-12-07 16:49 ` Richard Henderson
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