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19 #ifndef GRPC_CORE_LIB_GPR_USEFUL_H
20 #define GRPC_CORE_LIB_GPR_USEFUL_H
24 #define GPR_MIN(a, b) ((a) < (b) ? (a) : (b))
25 #define GPR_MAX(a, b) ((a) > (b) ? (a) : (b))
26 #define GPR_CLAMP(a, min, max) ((a) < (min) ? (min) : (a) > (max) ? (max) : (a))
28 #define GPR_ROTL(x, n) (((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n))))
29 #define GPR_ROTR(x, n) (((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n))))
31 #define GPR_ARRAY_SIZE(array) (sizeof(array) / sizeof(*(array)))
33 #define GPR_SWAP(type, a, b) \
41 #define GPR_BITSET(i, n) ((*(i)) |= (1u << (n)))
44 #define GPR_BITCLEAR(i, n) ((*(i)) &= ~(1u << (n)))
47 #define GPR_BITGET(i, n) (((i) & (1u << (n))) != 0)
49 #define GPR_INTERNAL_HEXDIGIT_BITCOUNT(x) \
50 ((x) - (((x) >> 1) & 0x77777777) - (((x) >> 2) & 0x33333333) - \
51 (((x) >> 3) & 0x11111111))
54 #define GPR_BITCOUNT(i) \
55 (((GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) + \
56 (GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) >> 4)) & \
60 #define GPR_ICMP(a, b) ((a) < (b) ? -1 : ((a) > (b) ? 1 : 0))
62 #define GPR_HASH_POINTER(x, range) \
63 ((((size_t)x) >> 4) ^ (((size_t)x) >> 9) ^ (((size_t)x) >> 14)) % (range)