33 lines
788 B
C
33 lines
788 B
C
#include <dix-config.h>
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#include <X11/Xfuncproto.h>
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#undef Ones
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/*
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* this is specifically for NVidia proprietary driver: they're again lagging
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* behind a year, doing at least some minimal cleanup of their code base.
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* All attempts to get in direct contact with them have failed.
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*/
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/*
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* this is only needed for the 570.x nvidia drivers
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*/
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_X_EXPORT int Ones(unsigned long /*mask */ );
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int
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Ones(unsigned long mask)
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{ /* HACKMEM 169 */
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/* can't add a message here because this should be fast */
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#if __has_builtin(__builtin_popcountl)
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return __builtin_popcountl (mask);
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#else
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unsigned long y;
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y = (mask >> 1) & 033333333333;
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y = mask - y - ((y >> 1) & 033333333333);
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return (((y + (y >> 3)) & 030707070707) % 077);
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#endif
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}
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