From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: [PATCH] fix a bug in the rand48 family of prng
Date: Sun, 21 Sep 2014 18:12:45 +0200 [thread overview]
Message-ID: <20140921161244.GX21835@port70.net> (raw)
In-Reply-To: <alpine.LNX.2.00.1409211958060.13391@monopod.intra.ispras.ru>
* Alexander Monakov <amonakov@ispras.ru> [2014-09-21 20:01:08 +0400]:
> unsigned short a[3];
> long long foo()
> {
> return a[0] | a[1] << 16 | a[2]+0ull<<32;
> }
> long long bar()
> {
> return a[0] | a[1]+0u << 16 | a[2]+0ull<<32;
> }
ah yes signextension explains the problem
btw original mail said:
> printf("%ld %ld %ld\n", lrand48(), lrand48(), lrand48());
> ...
> I expected to get the same sequence because...
the arg evaluation order is unspecified so
one should expect the same numbers but not
in the same order for this test
next prev parent reply other threads:[~2014-09-21 16:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-21 14:39 Jens Gustedt
2014-09-21 15:34 ` Szabolcs Nagy
2014-09-21 15:56 ` Alexander Monakov
2014-09-21 16:01 ` Alexander Monakov
2014-09-21 16:12 ` Szabolcs Nagy [this message]
2014-09-21 16:05 ` Jens Gustedt
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