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Re: bootstrap failure on darwin, compare stages
- To: David Edelsohn <dje at watson dot ibm dot com>
- Subject: Re: bootstrap failure on darwin, compare stages
- From: Dale Johannesen <dalej at apple dot com>
- Date: Fri, 21 Sep 2001 14:06:17 -0700
- Cc: Dale Johannesen <dalej at apple dot com>, toa at pop dot agri dot ch, GCC <gcc at gcc dot gnu dot org>
On Friday, September 21, 2001, at 12:56 PM, David Edelsohn wrote:
> I have been seeing stage compare failures for GCC on AIX ever
> since the conversion of HOST_WIDE_INT to "long long" for 64-bit targets
> built on 32-bit hosts. The problem never produces incorrect code, but
> something non-deterministic is occurring in the compiler. The example of
> the comparison failure on AIX is one assembly file duplicating a TOC entry
> while the other file re-uses the old entry through an alias. It seems
> like something not hashing to the same value or some wild write, but I and
> others have not been able to track it down after looking all Summer.
FWIW, I've never seen this on Darwin (32/32), and nobody else has reported
it. So it's in the 64-bit-specific part, but you probably knew that.
Could be you're treating a 32-bit value as 64 somewhere, thus picking up
32 random bits.