osMath.h

/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef TDENGINE_OS_MATH_H
#define TDENGINE_OS_MATH_H

#ifdef __cplusplus
extern "C" {
#endif

#define POW2(x) ((x) * (x))
#define ABS(x) ((x) > 0 ? (x) : -(x))

#if defined(_TD_WINDOWS_64) || defined(_TD_WINDOWS_32)

  #define SWAP(a, b, c) \
    do {                \
      c __tmp = (c)(a); \
      (a) = (c)(b);     \
      (b) = __tmp;      \
    } while (0)
  #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  #define MIN(a, b) (((a) < (b)) ? (a) : (b))

#else

  #define SWAP(a, b, c)      \
    do {                     \
      typeof(a) __tmp = (a); \
      (a) = (b);             \
      (b) = __tmp;           \
    } while (0)

  #define MAX(a, b)            \
    ({                         \
      typeof(a) __a = (a);     \
      typeof(b) __b = (b);     \
      (__a > __b) ? __a : __b; \
    })

  #define MIN(a, b)            \
    ({                         \
      typeof(a) __a = (a);     \
      typeof(b) __b = (b);     \
      (__a < __b) ? __a : __b; \
    })
#endif

#ifdef __cplusplus
}
#endif

#endif