linux-kernel - Re: [RFC PATCH] crypto: crc32c-pclmul

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Message-ID: <20140528153249.18014.qmail@ns.horizon.com>
Date:	28 May 2014 11:32:49 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	herbert@...dor.apana.org.au, JBeulich@...e.com, linux@...izon.com,
	tim.c.chen@...ux.intel.com
Cc:	linux-kernel@...r.kernel.org, sandyw@...tter.com
Subject: Re: [RFC PATCH] crypto: crc32c-pclmul - Use pmovzxdq to shrink K_table

Um, yeah, I just noticed the problem with that patch: half of the numbers
in that table are 33 bits, and cause a pile of warnings (not errors,
unfortunately!) from gas that scrolled by when I wasn't looking.

Logically, there should be no need for 33-bit values; they should all be
reducible modulo the polynomial.  But that is going to take a slightly
larger change.
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