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Message-ID: <1411307159.4884.183.camel@eris.loria.fr>
Date: Sun, 21 Sep 2014 15:45:59 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: Re: Re: drand48() gives wrong sequence?
Am Sonntag, den 21.09.2014, 14:27 +0100 schrieb Justin Cormack:
> Hmm, just checked on a non-OSv Musl system and get the same result as
> you. I also checked on NetBSD and FreeBSD and they give the same
> result as glibc, so I think there must be a Musl bug.
In __rand48_step there is this line
x = xi[0] | xi[1]<<16 | xi[2]+0ULL<<32;
on arch with 16bit int this would be UB, no? Do we have such archs,
still?
In any case, doing something like
x = xi[0]+0ULL | xi[1]+0ULL<<16 | xi[2]+0ULL<<32;
shouldn't cost anything and should ensure the correct conversion in
all cases.
Jens
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