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Open Source and information security mailing list archives
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Date: Mon, 22 Oct 2007 20:39:59 -0700 From: Joe Perches <joe@...ches.com> To: Stephen Hemminger <shemminger@...ux-foundation.org> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>, netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net> Subject: Re: [PATCH] - trivial - Improve appletalk checksum calculation On Mon, 2007-10-22 at 20:30 -0700, Stephen Hemminger wrote: > > Corrected fast code is: > > > > while (len--) { > > sum += *data++; > > sum <<= 1; > > sum = (((sum & 0x10000) >> 16) + sum) & 0xffff; > > } > > > > At least it is correct on the standalone random data test, and the > > new code is 30% faster for the cached memory case (13.7 clks/byte vs 18 > > clks/byte). > Your code looks different... Both are 16 bit rotate lefts. Which looks clearer? - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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