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Fix DIVIDE BY ZERO exception in init_search()

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It happens that when d == 0 we calculate:

log(double(0 * 0) / 2)

Unfortunately, log(0) is "illegal" and can generate either a
floating point exception or return a nonsense "huge" value
depending on the platform.

This fixs in the proper way the GCC/ICC rounding difference,
bug was from our side, not in the intel compiler.

Also fixed some few other warnings.

Bug spotted by Richard Lloyd.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-07-03 16:02:07 +01:00
parent 3578207974
commit 1d4e7bbdf5
4 changed files with 6 additions and 6 deletions
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2
src/evaluate.cpp
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@@ -894,7 +894,7 @@ namespace {
Square s = pop_1st_bit(&b);
Square queeningSquare = relative_square(c, make_square(square_file(s), RANK_8));
int d = square_distance(s, queeningSquare)
- (relative_rank(c, s) == RANK_2) // Double pawn push
- int(relative_rank(c, s) == RANK_2) // Double pawn push
- square_distance(pos.king_square(opposite_color(c)), queeningSquare)
+ int(c != pos.side_to_move());