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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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9
apps/codecs/lib/codeclib.h
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@ -57,6 +57,15 @@ void qsort(void *base, size_t nmemb, size_t size, int(*compar)(const void *, con
extern void mdct_backward(int n, int32_t *in, int32_t *out);
#if defined(CPU_ARM) && (ARM_ARCH == 4)
/* optimised unsigned integer division for ARMv4, in IRAM */
unsigned udiv32_arm(unsigned a, unsigned b);
#define UDIV32(a, b) udiv32_arm(a, b)
#else
/* default */
#define UDIV32(a, b) (a / b)
#endif
/* Various codec helper functions */
int codec_init(void);