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| author | Jens Arnold <amiconn@rockbox.org> | 2008-10-29 07:14:37 +0000 |
|---|---|---|
| committer | Jens Arnold <amiconn@rockbox.org> | 2008-10-29 07:14:37 +0000 |
| commit | 9ae256186282db0ed0e5491c925f92e61591f396 (patch) | |
| tree | 6dd3d9bb4f521f6b449ea4aa374b598d756bae7c /firmware/decompressor/sh_nrv2e_d8.S | |
| parent | 2d4eacb9ec06e636519f6065c78c8f481b587f94 (diff) | |
| download | rockbox-9ae256186282db0ed0e5491c925f92e61591f396.tar.gz rockbox-9ae256186282db0ed0e5491c925f92e61591f396.zip | |
Save another 4 bytes without sacrificing performance by subroutine rearrangement.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18916 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/decompressor/sh_nrv2e_d8.S')
| -rw-r--r-- | firmware/decompressor/sh_nrv2e_d8.S | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/firmware/decompressor/sh_nrv2e_d8.S b/firmware/decompressor/sh_nrv2e_d8.S index c002911c0c..167251d595 100644 --- a/firmware/decompressor/sh_nrv2e_d8.S +++ b/firmware/decompressor/sh_nrv2e_d8.S @@ -81,15 +81,6 @@ eof_n2e: rts mov src, r0 - .align 2 -get1_n2e: ! in: T bit set - mov.b @src+, bits ! SH1 sign-extends on load - rotcl bits ! LSB = T, T = MSB - shll16 bits - rts - shll8 bits - - .align 2 lit_n2e: mov.b @src, tmp add #1, src ! Need to fill the pipeline latency anyway @@ -135,6 +126,13 @@ len_n2e: bra gotlen_n2e add #6-2, len +get1_n2e: ! in: T bit set + mov.b @src+, bits ! SH1 sign-extends on load + rotcl bits ! LSB = T, T = MSB + shll16 bits + rts + shll8 bits + lenlast_n2e: getnextb(len) ! 0,1,2,3 add #2, len @@ -143,11 +141,11 @@ gotlen_n2e: movt tmp ! too far away, so minimum match length is 3 add tmp, len copy_n2e: - add #-1, len mov.b @(off,dst), tmp - tst len, len + add #-1, len mov.b tmp, @dst add #1, dst + tst len, len bf copy_n2e bra top_n2e nop |