mirror of https://github.com/OpenTTD/OpenTTD
(svn r19789) -Add [FS#3519]: a typed FOR_EACH_SET_BIT (adf88)
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2c25f51281
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@ -306,6 +306,31 @@ static FORCEINLINE T ROR(const T x, const uint8 n)
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return (T)(x >> n | x << (sizeof(x) * 8 - n));
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}
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/**
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* Do an operation for each set bit in a value.
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*
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* This macros is used to do an operation for each set
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* bit in a variable. The second parameter is a
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* variable that is used as the bit position counter.
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* The fourth parameter is an expression of the bits
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* we need to iterate over. This expression will be
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* evaluated once.
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*
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* @param Tbitpos_type Type of the position counter variable.
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* @param bitpos_var The position counter variable.
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* @param Tbitset_type Type of the bitset value.
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* @param bitset_value The bitset value which we check for bits.
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*
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* @see FOR_EACH_SET_BIT
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*/
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#define FOR_EACH_SET_BIT_EX(Tbitpos_type, bitpos_var, Tbitset_type, bitset_value) \
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for ( \
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Tbitset_type ___FESBE_bits = (bitpos_var = (Tbitpos_type)0, bitset_value); \
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___FESBE_bits != (Tbitset_type)0; \
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___FESBE_bits = (Tbitset_type)(___FESBE_bits >> 1), bitpos_var++ \
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) \
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if ((___FESBE_bits & 1) != 0)
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/**
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* Do an operation for each set set bit in a value.
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*
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@ -316,13 +341,10 @@ static FORCEINLINE T ROR(const T x, const uint8 n)
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* we need to iterate over. This expression will be
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* evaluated once.
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*
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* @param i The position counter
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* @param b The value which we check for set bits
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* @param bitpos_var The position counter variable.
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* @param bitset_value The value which we check for set bits.
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*/
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#define FOR_EACH_SET_BIT(i, b) \
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for (uint __FESB_bits = (i = 0, b); __FESB_bits != 0; i++, __FESB_bits >>= 1) \
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if (__FESB_bits & 1)
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#define FOR_EACH_SET_BIT(bitpos_var, bitset_value) FOR_EACH_SET_BIT_EX(uint, bitpos_var, uint, bitset_value)
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#if defined(__APPLE__)
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/* Make endian swapping use Apple's macros to increase speed
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