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Enable POPCNT only through Makefile

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Also remove some fallback templates that prevent a
compile error in case the user runs 'make icc-profile-popcnt'
from a non supported machine.

We want to loudly fail in that case instead of silently
fallback in a non-popcount compilation.

Updated documentation too.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-06 17:23:02 +01:00
parent 53ce6ce49c
commit 7c0cb8e73d
2 changed files with 5 additions and 24 deletions
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Readme.txt
+1 -2
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@@ -58,8 +58,7 @@ flag changing from -DNBIGENDIAN to -DBIGENDIAN in the Makefile.
Stockfish has POPCNT instruction runtime detection and support. This can
give an extra speed on Core i7 or similar systems. To enable this feature
(disabled by default) simply uncomment #define USE_POPCNT in bitcount.h
before to compile.
compile with 'make icc-profile-popcnt'
On 64 bit Unix-like systems the 'bsfq' assembly instruction will be used
for bit counting. Detection is automatic at compile time, but in case you