2020-07-01 02:55:47 +00:00
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#ifndef COSMOPOLITAN_LIBC_BITS_POPCNT_H_
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#define COSMOPOLITAN_LIBC_BITS_POPCNT_H_
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#include "libc/nexgen32e/x86feature.h"
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COSMOPOLITAN_C_START_
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2024-01-09 09:26:03 +00:00
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libcesque size_t _countbits(const void *, size_t);
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libcesque unsigned long popcnt(unsigned long) pureconst;
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2020-07-01 02:55:47 +00:00
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2023-05-02 02:43:59 +00:00
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#if defined(__GNUC__) && !defined(__STRICT_ANSI__) && defined(__x86_64__)
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2021-06-15 13:24:46 +00:00
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#define popcnt(X) \
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(__builtin_constant_p(X) ? __builtin_popcountll(X) : ({ \
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unsigned long PoP = (X); \
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if (X86_HAVE(POPCNT)) { \
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asm("popcnt\t%0,%0" : "+r"(PoP) : /* no inputs */ : "cc"); \
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} else { \
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PoP = (popcnt)(PoP); \
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} \
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PoP; \
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2020-07-01 02:55:47 +00:00
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}))
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2023-05-02 02:43:59 +00:00
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#else
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#define popcnt(x) __builtin_popcountll(x)
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2020-07-01 02:55:47 +00:00
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#endif /* GNUC && !ANSI */
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COSMOPOLITAN_C_END_
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#endif /* COSMOPOLITAN_LIBC_BITS_POPCNT_H_ */
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