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libtremor: tiny optimization 0.5%-1.5% on coldfire and PP

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28285 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2010-10-16 09:58:21 +00:00
parent 055071195c
commit c1bfe4eb62
1 changed files with 2 additions and 1 deletions
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3
apps/codecs/libtremor/codebook.c
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@ -277,6 +277,7 @@ static long decode_packed_block(codebook *book, oggpack_buffer *b,
long *buf, int n){
long *bufptr = buf;
long *bufend = buf + n;
const unsigned int cachemask = (1<<book->dec_firsttablen)-1;
while (bufptr<bufend) {
if (b->headend > 8) {
@ -302,7 +303,7 @@ static long decode_packed_block(codebook *book, oggpack_buffer *b,
bit+=32;
}
ogg_int32_t entry = book->dec_firsttable[cache&((1<<book->dec_firsttablen)-1)];
ogg_int32_t entry = book->dec_firsttable[cache&cachemask];
if(UNLIKELY(entry < 0)){
const long lo = (entry>>15)&0x7fff, hi = book->used_entries-(entry&0x7fff);
entry = bisect_codelist(lo, hi, cache, book->codelist);