bug#18438: 24.4.50; assertion failed in bidi.c

[Eli Zaretskii]

> From: Ivan Shmakov <ivan@siamics.net>
> Date: Mon, 20 Oct 2014 19:35:01 +0000
> 
> >>>>> Eli Zaretskii <eliz@gnu.org> writes:
> >>>>> From: Eli Zaretskii <eliz@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.