nanogui: [patch] fix for zero width/height rectangles
Subject:
Re: [nanogui] Re: [patch] fix for zero width/height rectangles
From:
Alex Holden ####@####.####
Date:
16 Jul 2005 08:53:55 +0100
Message-Id: <ABA4FBF6-8E34-4D7A-B0BA-A03FAF50887C@linuxhacker.org>
On 16 Jul 2005, at 02:39, Sun Yingfeng wrote:
> I think the first case:
> if (!w || !h)
> return;
> case reduce execution time than:
> if ((w == 0) || (h == 0))
> return;
> Because judge "not equal" is need less time than judge "equal" in
> most CPU.
That's not right; the two are functionally identical and pretty much
any modern compiler should generate the same machine code in both cases.
Having said that, I personally would use the former as a matter of
style. '!variable' is such a common idiom in C that the meaning is
instantly obvious, and it's quicker to type/read.
--
------------ Alex Holden - http://www.alexholden.net/ ------------
If it doesn't work, you're not hitting it with a big enough hammer
