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Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86
- From: Janis Johnson <janis187 at us dot ibm dot com>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 20 May 2003 22:46:01 -0000
- Subject: Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3 -fPIC on x86
- Reply-to: Janis Johnson <janis187 at us dot ibm dot com>
The following reply was made to PR optimization/10877; it has been noted by GNATS.
From: Janis Johnson <janis187@us.ibm.com>
To: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org,
lloyd@acm.jhu.edu, nobody@gcc.gnu.org, ebotcazou@libertysurf.fr
Cc:
Subject: Re: optimization/10877: [3.3/3.4 regression] miscompilation with -O3
-fPIC on x86
Date: Tue, 20 May 2003 15:32:32 -0700
The pc_thunk started going into %eax with this patch:
> 2003-03-12 Eric Botcazou <ebotcazou@libertysurf.fr>
>
> PR optimization/9888
> * config/i386/i386.md (jcc_1): Fix range.
> (jcc_2): Likewise.
> (jump): LIkewise.
> (doloop_end_internal): Likewise.
>
> 2003-03-12 Eric Botcazou <ebotcazou@libertysurf.fr>
>
> PR optimization/9888
> * config/i386/i386.md (movsi_1): Remove special alternatives
> for %eax register.
> (movsi_1_nointernunit): Likewise.
> (movhi_1): Likewise.
> * config/i386/i386.c (memory_address_length): Do not use
> short displacement when there is no base.
> (ix86_attr_length_address_default): Handle LEA instructions.
This was tested using Wolfgang's smaller testcase and
searching for '_GLOBAL_OFFSET_TABLE_, %eax' in the .s file.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10877