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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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4
apps/codecs/lib/SOURCES
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@ -7,9 +7,7 @@ mdct_lookup.c
#ifdef CPU_ARM
mdct_arm.S
setjmp_arm.S
#if ARM_ARCH == 4
udiv32_armv4.S
#endif
udiv32_arm.S
#endif
#ifdef CPU_COLDFIRE