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Improvements to specialized dividers for APE codec:

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* Use Newton-Raphson divider on ARMv5e and ARMv6, about 7% speedup on Gigabeat S.
* On ARMv4 targets using IRAM, remove insane filter buffer from IRAM, fill available IRAM with LUT of reciprocals for small divisors - speedup varies according to target and available IRAM, APE normal sample is approx. 109% RT on e200.
* Rename apps/codecs/lib/udiv32_armv4.S to apps/codecs/lib/udiv32_arm.S, which includes dividers for all ARM targets specialized for APE.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24354 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Andrew Mahone 2010-01-28 02:28:52 +00:00
parent e18e806930
commit e76f30a57c
5 changed files with 323 additions and 140 deletions
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2
apps/codecs/lib/codeclib.h
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@ -65,7 +65,7 @@ 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)
#ifdef CPU_ARM
/* optimised unsigned integer division for ARMv4, in IRAM */
unsigned udiv32_arm(unsigned a, unsigned b);
#define UDIV32(a, b) udiv32_arm(a, b)