linux-kernel - Re: [PATCH] ARC: Fix _

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Message-ID: <1377756078.1928.89.camel@joe-AO722>
Date:	Wed, 28 Aug 2013 23:01:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Mischa Jonker <Mischa.Jonker@...opsys.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Joern Rennecke <joern.rennecke@...ecosm.com>
Subject: Re: [PATCH] ARC: Fix __udelay parentheses

On Thu, 2013-08-29 at 05:55 +0000, Vineet Gupta wrote:

> The intent of writing orig code was to generate only 1 MPYHU insn (32*32 =
> high-part-64) for the whole math, at any optimization level whatsoever. If the
> first MPY is overflowing, u r likely spinning for > 10,000 usec (10ms) which is 1
> scheduling tick on ARC - not good - presumably for hardware debug. It would be
> better to use a tight loop there and throw it out later.

It's a delay loop.  Does it matter whether
or not a multiply or division is used?


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