GNU bug report logs - #16535
Compiler bug ?

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Package: emacs;

Reported by: Fabrice Popineau <fabrice.popineau <at> gmail.com>

Date: Fri, 24 Jan 2014 15:05:01 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #19 received at 16535-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Fabrice Popineau <fabrice.popineau <at> gmail.com>
Cc: 16535-done <at> debbugs.gnu.org
Subject: Re: Compiler bug ?
Date: Fri, 24 Jan 2014 15:35:21 -0800

On 01/24/2014 03:06 PM, Fabrice Popineau wrote:
> Actually, afaik BITS_PER_ULL == BITS_PER_BITS_WORD

Ah, OK, thanks for following up. It looks like the negated-comparison 
bug caused undefined behavior due to integer overflow in 
count_one_bits_word; once that happens it's anybody's guess what 
compilers will do; maybe you hit the jackpot. Anyway, the Emacs bug is 
fixed (and there doesn't seem to have been a compiler bug) so I'll close 
this report.
This bug report was last modified 11 years and 177 days ago.

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