powerpc: word-at-a-time optimization for 64-bit Little Endian

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This is an optimization for the PowerPC in 64-bit
little-endian. Bit counting is used in find_zero(), instead
of the multiply and shift.

It is modelled after Alan Modra's PowerPC LE strlen patch
http://sourceware.org/ml/libc-alpha/2013-08/msg00097.html.

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Philippe Bergheaud 2013-09-26 08:30:09 +02:00 • committed by Benjamin Herrenschmidt

parent 9c662cad2f

commit d0cebfa650

1 changed files with 32 additions and 25 deletions

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arch/powerpc/include/asm/word-at-a-time.h

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