Nils O. Selåsdal
87 lines
1.2 KiB
C
87 lines
1.2 KiB
C
#ifndef UC_MATH_H_
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#define UC_MATH_H_
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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uint32_t
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uc_gcd_32(uint32_t a, uint32_t b);
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uint64_t
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uc_gcd_64(uint64_t a, uint64_t b);
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uint32_t
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uc_phi_32(uint32_t N);
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uint64_t
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uc_phi_64(uint64_t N);
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#if defined(__has_builtin)
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# if __has_builtin(__builtin_clzll)
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# define HAVE_BUILTIN_CLZ 1
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# endif
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#endif
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#if HAVE_BUILTIN_CLZ
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static inline uint32_t
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uc_nextpow2(uint32_t x)
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{
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if (x <= 1) return 1;
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return 1u << (32 - __builtin_clz(x - 1));
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return x;
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}
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static inline uint64_t
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uc_nextpow2_64(uint64_t x)
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{
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if (x <= 1) return 1;
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return 1u << (64 - __builtin_clzll(x - 1));
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return x;
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}
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#else
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static inline uint32_t
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uc_nextpow2(uint32_t x)
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{
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if (x == 0) {
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return 1;
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}
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x++;
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return x;
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}
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static inline uint64_t
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uc_nextpow2(uint64_t x)
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{
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if (x == 0) {
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return 1;
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}
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x--;
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x |= x >> 1;
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x |= x >> 2;
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x |= x >> 4;
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x |= x >> 8;
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x |= x >> 16;
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x |= x >> 32;
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x++;
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return x;
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}
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#endif
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#undef HAVE_BUILTIN_CLZ
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#ifdef __cplusplus
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}
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#endif
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#endif
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