Rockbox.org home
release
dev builds
extras
themes manual
wiki
device status forums
mailing lists
IRC bugs
patches
dev guide
translations



Rockbox mail archive

Subject: Re: More efficient bitswap.s

Re: More efficient bitswap.s

From: Magnus Holmgren <lear_at_algonet.se>
Date: Thu, 24 Oct 2002 14:18:21 +0200 (MEST)

Ray Ransom wrote:

> Here is a more efficient version of bitswap.s. It has one less instruction
> in the all-important loop, fewer instructions in the initial test and uses
> fewer registers. If any cares, it's attached.

The last byte swap isn't correct:

        mov.b _at_r4,r1
        extu.b r0,r1
        mov.b _at_(r0,r1),r1
        mov.b r1,_at_r4

Should be "extu.b r1,r1" (as in the first byte swap).

  Magnus

  • APPLICATION/OCTET-STREAM attachment: bitswap.s
Received on 2002-10-24

Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy