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Rewrite Score extractors

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Less tricky and even a bit faster. With this
version Visual Studio Ultimate 2013 Update 2 RC
runs fine even in O2 optimization.

No functional change.
This commit is contained in:
Ron Britvich 2014-05-05 08:52:14 +02:00 • committed by Marco Costalba
parent b8e6f83cfb
commit 8f6a494ad7
1 changed files with 17 additions and 6 deletions
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23
src/types.h
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@ -267,17 +267,28 @@ enum Score {
SCORE_ENSURE_INTEGER_SIZE_N = INT_MIN SCORE_ENSURE_INTEGER_SIZE_N = INT_MIN
}; };
inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); } typedef union {
uint32_t full;
struct { int16_t eg, mg; } half;
} ScoreView;
inline Score make_score(int mg, int eg) {
ScoreView v;
v.half.mg = (int16_t)mg - (uint16_t(eg) >> 15);
v.half.eg = (int16_t)eg;
return Score(v.full);
}
/// Extracting the signed lower and upper 16 bits is not so trivial because
/// according to the standard a simple cast to short is implementation defined
/// and so is a right shift of a signed integer.
inline Value mg_value(Score s) { inline Value mg_value(Score s) {
return Value(((s + 0x8000) & ~0xffff) / 0x10000); ScoreView v;
v.full = s;
return Value(v.half.mg + (uint16_t(v.half.eg) >> 15));
} }
inline Value eg_value(Score s) { inline Value eg_value(Score s) {
return Value((int)(unsigned(s) & 0x7FFFU) - (int)(unsigned(s) & 0x8000U)); ScoreView v;
v.full = s;
return Value(v.half.eg);
} }
#define ENABLE_BASE_OPERATORS_ON(T) \ #define ENABLE_BASE_OPERATORS_ON(T) \