Re: target/8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1

[Peter Barada <pbarada@mail.wm.sps.mot.com>]

The following reply was made to PR target/8343; it has been noted by GNATS.

From: Peter Barada <pbarada@mail.wm.sps.mot.com>
To: graham.stott@btinternet.com
Cc: joel@gcc.gnu.org, ccj@acm.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
        joel@OARcorp.com, nobody@gcc.gnu.org, Peter.Barada@motorola.com,
        gcc-gnats@gcc.gnu.org
Subject: Re: target/8343: m68k-elf/rtems ICE at instantiate_virtual_regs_1
Date: Fri, 25 Oct 2002 15:27:34 -0400

 > 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
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