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Tweaked IRAM usage in the Vorbis codec. Speeds up decoding by about 10% on a couple of test files.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7249 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Magnus Holmgren 2005-07-28 12:04:41 +00:00
parent b65b52b1b9
commit 7e33f16aee
5 changed files with 13 additions and 9 deletions
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4
apps/codecs/Tremor/bitwise.c
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@ -22,7 +22,7 @@
#include <string.h>
#include "ogg.h"
static const unsigned long mask[] =
static const unsigned long mask[] IDATA_ATTR =
{0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
@ -79,6 +79,7 @@ void oggpack_readinit(oggpack_buffer *b,ogg_reference *r){
}
/* Read in bits without advancing the bitptr; bits <= 32 */
long oggpack_look(oggpack_buffer *b,int bits) ICODE_ATTR;
long oggpack_look(oggpack_buffer *b,int bits){
unsigned long m=mask[bits];
unsigned long ret=0;
@ -139,6 +140,7 @@ long oggpack_look(oggpack_buffer *b,int bits){
}
/* limited to 32 at a time */
void oggpack_adv(oggpack_buffer *b,int bits) ICODE_ATTR;
void oggpack_adv(oggpack_buffer *b,int bits){
bits+=b->headbit;
b->headbit=bits&7;