From: Jean-Francois Romang <jeanfrancois.romang@gmail.com>
Date: Thu, 11 Oct 2012 14:55:25 +0000 (+0800)
Subject: ARM lsb/msb assembly
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=7f9ebf8e86e90ea1eb68388f1be12503a3f31e56;hp=7f9ebf8e86e90ea1eb68388f1be12503a3f31e56

ARM lsb/msb assembly

Implement lsb/msb using armv7 assembly instructions.
msb is the easiest one, using a gcc intrinsic that generates
code using the ARM's clz instruction. lsb is also using this
clz instruction, but with the help of ARM's 'rbit' (bit
reversing) instruction. This leads to a >2% speed gain.

I also renamed 'arm-32' to the more meaningfull 'armv7' in the Makefile

No functional change.
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