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Rewrite Score extractors
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.
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1 changed files with 17 additions and 6 deletions
23
src/types.h
23
src/types.h
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@ -267,17 +267,28 @@ enum Score {
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SCORE_ENSURE_INTEGER_SIZE_N = INT_MIN
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};
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inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
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typedef union {
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uint32_t full;
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struct { int16_t eg, mg; } half;
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} ScoreView;
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inline Score make_score(int mg, int eg) {
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ScoreView v;
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v.half.mg = (int16_t)mg - (uint16_t(eg) >> 15);
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v.half.eg = (int16_t)eg;
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return Score(v.full);
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}
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/// Extracting the signed lower and upper 16 bits is not so trivial because
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/// according to the standard a simple cast to short is implementation defined
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/// and so is a right shift of a signed integer.
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inline Value mg_value(Score s) {
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return Value(((s + 0x8000) & ~0xffff) / 0x10000);
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ScoreView v;
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v.full = s;
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return Value(v.half.mg + (uint16_t(v.half.eg) >> 15));
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}
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inline Value eg_value(Score s) {
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return Value((int)(unsigned(s) & 0x7FFFU) - (int)(unsigned(s) & 0x8000U));
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ScoreView v;
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v.full = s;
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return Value(v.half.eg);
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}
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#define ENABLE_BASE_OPERATORS_ON(T) \
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