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Further optimised (vs. libgcc) unsigned 32 bit division for ARMv4 (based on the ARMv5(+) version from libgcc), in IRAM on PP for better performance on PP5002, and put into the codeclib for possible reuse. APE -c1000 is now usable on both PP502x and PP5002 (~138% realtime, they're on par now). Gigabeat F/X should also see an APE speedup.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19009 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-11-05 00:10:05 +00:00
parent 7a835ee0c6
commit fe04e40be7
4 changed files with 137 additions and 3 deletions
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14
apps/codecs/demac/libdemac/rangecoding.h
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@ -49,6 +49,14 @@ removing the rc parameter from each function (and the RNGC macro)).
*/
#ifdef ROCKBOX
#include "../lib/codeclib.h"
/* for UDIV32() */
#endif
#ifndef UDIV32
#define UDIV32(a, b) (a / b)
#endif
/* BITSTREAM READING FUNCTIONS */
@ -121,15 +129,15 @@ static inline void range_dec_normalize(void)
static inline int range_decode_culfreq(int tot_f)
{
range_dec_normalize();
rc.help = rc.range / tot_f;
return rc.low / rc.help;
rc.help = UDIV32(rc.range, tot_f);
return UDIV32(rc.low, rc.help);
}
static inline int range_decode_culshift(int shift)
{
range_dec_normalize();
rc.help = rc.range >> shift;
return rc.low / rc.help;
return UDIV32(rc.low, rc.help);
}