From: Marco Costalba <mcostalba@gmail.com>
Date: Fri, 14 Feb 2014 09:43:37 +0000 (+0100)
Subject: Fix magic boosters conversion
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=b3470d7ab1d8cfe0bacffc42fc9b30347940b5f4;hp=e4695f15bc62c0e34572b3a995e25b7461d2ae90

Fix magic boosters conversion

Fix small overflow error while converting
magic boosters from right rotate to left rotate,
in particular booster 38 was converted to 4122
instead of the corrcet value 26.

Formula used was:

s1 = original & 63, s2 = (original >> 6) & 63;
new = (64 - s1) | ((64 - s2) << 6);

Instead of:

s1 = original & 63, s2 = (original >> 6) & 63;
new = ((64 - s1) & 63) | (((64 - s2) & 63) << 6);

This has no impact in number of cycles needed, but
just in the resultig number that yields to a rotate
amount bigger than 63.

Spotted by Ehsan Rashid.

No functional change.
---

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index b7eed922..3df7d425 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -255,7 +255,7 @@ namespace {
                    Bitboard masks[], unsigned shifts[], Square deltas[], Fn index) {
 
     int MagicBoosters[][8] = { {  969, 1976, 2850,  542, 2069, 2852, 1708,  164 },
-                               { 3101,  552, 3555,  926,  834, 4122, 2131, 1117 } };
+                               { 3101,  552, 3555,  926,  834,   26, 2131, 1117 } };
 
     RKISS rk;
     Bitboard occupancy[4096], reference[4096], edges, b;