From: Marco Costalba <mcostalba@gmail.com>
Date: Wed, 12 Aug 2009 07:40:03 +0000 (+0200)
Subject: Finally fix prefetch on Linux
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=fd12e8cb239180607559bb805e233f7ea704a67c;hp=fd12e8cb239180607559bb805e233f7ea704a67c;ds=inline

Finally fix prefetch on Linux

It was due to a missing -msse compiler option !

Without this option the CPU silently discards
prefetcht2 instructions during execution.

Also added a (gcc documented) hack to prevent Intel
compiler to optimize away the prefetches.

Special thanks to Heinz for testing and suggesting
improvments. And for Jim for testing icc on Windows.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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