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List:       gcc-bugs
Subject:    Re: tree-ssa branch broken
From:       Graham Stott <graham.stott () btinternet ! com>
Date:       2002-06-30 23:18:32
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Graham Stott wrote:
> Diego Novillo wrote:
> 
>> On Sat, 29 Jun 2002, Graham Stott wrote:
>>
>>
>>> I get the same segv compiling crtstuff.c with the stage2 compiler just
>>> built by stage1 and that is with and without rtl checking enabled.
>>>
>>
>> It's possible that I'm not getting a segv because of the older
>> binutils I'm running.  I still have not had time to look into it
>> any more than this.
>>
>>
>> Diego.
>>
> 
> I've pinned it down to insn-recog.c:recog_30() being miscompiled, some
> more digging should be able to pinpoint it further.
> 
> Graham
> 
> 

A bit more digging shows that the stack has been trashed on return
from recog_30, hence the segv.

The stack appears to get trashed in recog_22 called from recog_30
and looks to occur when setting "operand[0] = x2" part way thru
recog_22.

On entry to recog_22 a stack backtrace in gdb looks fine but after
the assignment to operand[0] the third entry in the backtrace is junk.

Cheers
Graham

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