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Re: target/8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1
- From: Peter Barada <pbarada at mail dot wm dot sps dot mot dot com>
- To: graham dot stott at btinternet dot com
- Cc: joel at gcc dot gnu dot org, ccj at acm dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, joel at OARcorp dot com, nobody at gcc dot gnu dot org, Peter dot Barada at motorola dot com, gcc-gnats at gcc dot gnu dot org
- Date: Fri, 25 Oct 2002 15:27:34 -0400
- Subject: Re: target/8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1
- References: <20021025125946.32168.qmail@sources.redhat.com> <3DB97CFD.6030701@btinternet.com>
> Synopsis: m68k-elf/rtems ICE at instantiate_virtual_regs_1
>
> State-Changed-From-To: open->feedback
> State-Changed-By: joel
> State-Changed-When: Fri Oct 25 05:59:45 2002
> State-Changed-Why:
> Peter Barada has this important piece of information which
> should be a big clue to fixing it:
>
> Ok, I've narrowed your ICE down to between two version, one 525 days
> ago(where it worked) and 523 days ago (where it failed).
>
> The verion from each is:
>
> Fail: version 3.1 20010519
> Work: version 3.1 20010517
I've narrowed it even further :-)
'cvs update -D "2001/05/19 04:24:49" gcc' works
'cvs update -D "2001/05/19 04:29:50" gcc' fails
The only thing of interest changing is gcc/gcc/recog.c, from version
1.102 to version 1.103.
The log for gcc/gcc/recog.c looks like:
revision 1.103
date: 2001/05/19 08:24:50; author: hubicka; state: Exp; lines: +85 -150
* recog.c (general_operand): Prohibit nonzero subreg bytes on
subregs containing mem.
This was with the following testcase:
extern unsigned foo;
unsigned long long
bar (void)
{
unsigned long long t = foo;
return t * foo;
}
Hope this helps someone find what's broken...
Now back to seeing if I can make any sense out of target/8309.
--
Peter Barada Peter.Barada@motorola.com
Wizard 781-852-2768 (direct)
WaveMark Solutions(wholly owned by Motorola) 781-270-0193 (fax)