Messages in this thread | | | Date | Wed, 21 May 2008 18:52:13 +0200 | From | Tilman Schmidt <> | Subject | Re: [PATCH 1/2] bitreversal program |
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Am 20.05.2008 17:25 schrieb Soumyadip Das Mahapatra: > I know that my bitrev8() takes more instructions than that > of yours. But we have to think about faster access of cpu cache over that > of memory cache(which your bit_rev_table uses).
bitrev8() is used on every transferred byte for certain types of ISDN connections, ie. with a steady rate of 8000 bytes/sec. Depending on the driver, it will be called for individual data bytes or possibly a small number of bytes at a time, typically not more than 64, and typically in interrupt context.
I'd expect the table driven version to perform better in those circumstances.
Thanks, Tilman
-- Tilman Schmidt E-Mail: tilman@imap.cc Bonn, Germany Diese Nachricht besteht zu 100% aus wiederverwerteten Bits. Ungeöffnet mindestens haltbar bis: (siehe Rückseite)
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