Re: Re: CRC

From: Bruce Guenter <bruceg(at)em(dot)ca>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Re: CRC
Date: 2000-12-10 21:38:29
Message-ID: 20001210153829.S9706@em.ca
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On Sun, Dec 10, 2000 at 12:24:59PM -0800, Alfred Perlstein wrote:
> I would try unrolling the loop some (if possible) and retesting.

The inner loop was already unrolled, but was only processing single
bytes at a time. By loading in 32-bit words at once, it reduced the
cost to only 7 cycles per byte (from 13).
--
Bruce Guenter <bruceg(at)em(dot)ca> http://em.ca/~bruceg/

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  • Re: Re: CRC at 2000-12-10 20:24:59 from Alfred Perlstein

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