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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 14 Apr 2011 13:33:14 -0700
Message-ID: <BANLkTim7D_+nmjU9ewZWoKftZ+_7YSegVQ@mail.gmail.com>
Subject: Re: [PATCH 4/6] signal: sigprocmask() should do retarget_shared_pending()
To: Oleg Nesterov <oleg@redhat.com>
Cc: Tejun Heo <tj@kernel.org>, Andrew Morton <akpm@linux-foundation.org>,
        "Nikita V. Youshchenko" <nyoushchenko@mvista.com>,
        Matt Fleming <matt@console-pimps.org>,
        Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org
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On Thu, Apr 14, 2011 at 1:10 PM, Oleg Nesterov <oleg@redhat.com> wrote:
>
> Well, I don't know the common definition... But please note that
> signandsets() does ((x) & ~(y)), so I defined nor as (x | ~y) by analogy.

Yeah, "nand" is really "not and" (ie "~((x)&(y))").

The expression ((x) & ~(y)) should typically be called "andn" (see for
example the x86 instruction set "pandn" and "andnpd" or whatever they
are called for sse instructions).

And "nor" really should be "~(x|y)". You want the "orn" combination
(and the famously hard-to-google "porn" instruction for the vectorized
version)

                Linus