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@ -187,21 +187,7 @@ static inline T ToggleBit(T &x, const uint8 y)
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#ifdef WITH_BITMATH_BUILTINS
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#define FIND_FIRST_BIT(x) FindFirstBit(x)
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inline uint8 FindFirstBit(uint32 x)
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{
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if (x == 0) return 0;
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return __builtin_ctz(x);
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}
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inline uint8 FindFirstBit64(uint64 x)
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{
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if (x == 0) return 0;
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return __builtin_ctzll(x);
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}
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#define FIND_FIRST_BIT(x) FindFirstBit<uint>(x)
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#else
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@ -220,10 +206,38 @@ extern const uint8 _ffb_64[64];
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*/
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#define FIND_FIRST_BIT(x) _ffb_64[(x)]
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uint8 FindFirstBit(uint32 x);
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uint8 FindFirstBit64(uint64 x);
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#endif
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/**
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* Search the first set bit in an integer variable.
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*
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* @param value The value to search
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* @return The position of the first bit set, or 0 when value is 0
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*/
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template <typename T>
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static inline uint8 FindFirstBit(T value)
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{
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static_assert(sizeof(T) <= sizeof(unsigned long long));
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#ifdef WITH_BITMATH_BUILTINS
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if (value == 0) return 0;
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typename std::make_unsigned<T>::type unsigned_value = value;
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if (sizeof(T) <= sizeof(unsigned int)) {
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return __builtin_ctz(unsigned_value);
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} else if (sizeof(T) == sizeof(unsigned long)) {
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return __builtin_ctzl(unsigned_value);
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} else {
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return __builtin_ctzll(unsigned_value);
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}
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#else
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if (sizeof(T) <= sizeof(uint32)) {
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extern uint8 FindFirstBit32(x);
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return FindFirstBit32(value);
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} else {
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extern uint8 FindFirstBit64(x);
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return FindFirstBit64(value);
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}
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#endif
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}
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uint8 FindLastBit(uint64 x);
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@ -275,6 +289,7 @@ static inline T KillFirstBit(T value)
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template <typename T>
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static inline uint CountBits(T value)
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{
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static_assert(sizeof(T) <= sizeof(unsigned long long));
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#ifdef WITH_BITMATH_BUILTINS
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typename std::make_unsigned<T>::type unsigned_value = value;
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if (sizeof(T) <= sizeof(unsigned int)) {
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