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25 lines
852 B
C
25 lines
852 B
C
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#ifndef MATHLIB_BITS_H
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#define MATHLIB_BITS_H
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//=============================================================================//
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//
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// Purpose: bitwise utilities.
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//
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//=============================================================================//
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//-----------------------------------------------------------------------------
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// '__popcnt' instruction reimplementation (allows for usage without requiring
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// a processor to feature the popcnt instruction, only use for tools that have
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// to run on processors that do NOT support popcnt!).
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//-----------------------------------------------------------------------------
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inline unsigned int PopCount(unsigned long long x)
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{
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unsigned int count = 0;
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while (x) {
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x &= x - 1; // Clears the least significant bit set to 1.
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count++;
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}
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return count;
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}
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#endif // MATHLIB_BITS_H
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