Thread (17 messages) read the whole thread 17 messages, 4 authors, 2009-03-16

Re: [PATCH] SBC encoder scale factors calculation optimized with __builtin_clz

From: Marcel Holtmann <marcel@holtmann.org>
Date: 2009-01-29 07:27:38

Hi Siarhei,
The attached patch contains optimization for scale factors calculation which
provides additional SBC encoder speedup.

For non-gcc compilers, CLZ function is implemented with a very simple and
slow straightforward code (but it is still faster than current git code even
if used instead of __builtin_clz). Something better could be done like: 
http://groups.google.com/group/comp.sys.arm/msg/5ae56e3a95a2345e?hl=en
But I'm not sure about license/copyright of the code at this link and decided
not to touch it. Anyway, I don't think that gcc implementation of
__builtin_clz for the CPU cores which do not support CLZ instruction is any
worse.
personally I don't really care about non-gcc compilers. I think that
some of the BlueZ source might not even compile without gcc.

Anyway, patch has been applied. Thanks.

Regards

Marcel

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