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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPC_CORE_LIB_GPR_USEFUL_H
#define GRPC_CORE_LIB_GPR_USEFUL_H
/** useful macros that don't belong anywhere else */
#define GPR_MIN(a, b) ((a) < (b) ? (a) : (b))
#define GPR_MAX(a, b) ((a) > (b) ? (a) : (b))
#define GPR_CLAMP(a, min, max) ((a) < (min) ? (min) : (a) > (max) ? (max) : (a))
/** rotl, rotr assume x is unsigned */
#define GPR_ROTL(x, n) (((x) << (n)) | ((x) >> (sizeof(x) * 8 - (n))))
#define GPR_ROTR(x, n) (((x) >> (n)) | ((x) << (sizeof(x) * 8 - (n))))
#define GPR_ARRAY_SIZE(array) (sizeof(array) / sizeof(*(array)))
#define GPR_SWAP(type, a, b) \
do { \
type x = a; \
a = b; \
b = x; \
} while (0)
/** Set the \a n-th bit of \a i (a mutable pointer). */
#define GPR_BITSET(i, n) ((*(i)) |= (1u << (n)))
/** Clear the \a n-th bit of \a i (a mutable pointer). */
#define GPR_BITCLEAR(i, n) ((*(i)) &= ~(1u << (n)))
/** Get the \a n-th bit of \a i */
#define GPR_BITGET(i, n) (((i) & (1u << (n))) != 0)
#define GPR_INTERNAL_HEXDIGIT_BITCOUNT(x) \
((x) - (((x) >> 1) & 0x77777777) - (((x) >> 2) & 0x33333333) - \
(((x) >> 3) & 0x11111111))
/** Returns number of bits set in bitset \a i */
#define GPR_BITCOUNT(i) \
(((GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) + \
(GPR_INTERNAL_HEXDIGIT_BITCOUNT(i) >> 4)) & \
0x0f0f0f0f) % \
255)
#define GPR_ICMP(a, b) ((a) < (b) ? -1 : ((a) > (b) ? 1 : 0))
#define GPR_HASH_POINTER(x, range) \
((((size_t)x) >> 4) ^ (((size_t)x) >> 9) ^ (((size_t)x) >> 14)) % (range)
#endif /* GRPC_CORE_LIB_GPR_USEFUL_H */
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