From: Joe Perches <joe@perches.com>
To: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Mischa Jonker <Mischa.Jonker@synopsys.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Joern Rennecke <joern.rennecke@embecosm.com>
Subject: Re: [PATCH] ARC: Fix __udelay parentheses
Date: Wed, 28 Aug 2013 23:01:18 -0700 [thread overview]
Message-ID: <1377756078.1928.89.camel@joe-AO722> (raw)
In-Reply-To: <C2D7FE5348E1B147BCA15975FBA23075140F26@IN01WEMBXA.internal.synopsys.com>
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?
next prev parent reply other threads:[~2013-08-29 6:01 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-28 18:29 Mischa Jonker
2013-08-28 18:45 ` Joe Perches
2013-08-28 18:53 ` Mischa Jonker
2013-08-28 19:01 ` Joe Perches
2013-08-28 19:12 ` Mischa Jonker
2013-08-29 1:43 ` Joe Perches
2013-08-29 5:55 ` Vineet Gupta
2013-08-29 6:01 ` Joe Perches [this message]
2013-08-29 6:24 ` Vineet Gupta
2013-08-29 6:37 ` Joe Perches
2013-08-29 6:49 ` Vineet Gupta
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