GNU bug report logs - #18438
24.4.50; assertion failed in bidi.c

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Ivan Shmakov <ivan <at> siamics.net>
Cc: 18438 <at> debbugs.gnu.org
Subject: bug#18438: 24.4.50; assertion failed in bidi.c
Date: Mon, 20 Oct 2014 22:39:56 +0300

> From: Ivan Shmakov <ivan <at> siamics.net>
> Date: Mon, 20 Oct 2014 19:35:01 +0000
> 
> >>>>> Eli Zaretskii <eliz <at> gnu.org> writes:
> >>>>> From: Eli Zaretskii <eliz <at> gnu.org>
> 
>  >> IOW, these all exhibit the same bug, just in different places in the
>  >> Emacs sources.
> 
>  > One possible cause that can explain all of these is that the CPU
>  > flags are reset between the comparison instruction and the following
>  > jump instruction.  For example, if the Zero flag is reset, then a
>  > test for a NULL pointer will misbehave.
> 
>  > Can anyone think of a scenario where this could happen?
> 
> 	For me, it’s much easier to imagine a misbehaving compiler here.
> 	Is there a chance of getting a disassembly at the points of
> 	interest?

It was posted several times in this bug report, look it up.

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