generic/lib/math/fract.inc

/*
 * Copyright (c) 2015 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#if __CLC_FPSIZE == 64
#define MIN_CONSTANT 0x1.fffffffffffffp-1
#define ZERO 0.0
#elif __CLC_FPSIZE == 32
#define MIN_CONSTANT 0x1.fffffep-1f
#define ZERO 0.0f
#elif __CLC_FPSIZE == 16
#define MIN_CONSTANT 0x1.ffcp-1h
#define ZERO 0.0h
#endif

_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fract(__CLC_GENTYPE x, private __CLC_GENTYPE *iptr) {
  *iptr = floor(x);
  __CLC_GENTYPE r = fmin(x - *iptr, MIN_CONSTANT);
  r = isinf(x) ? ZERO : r;
  r = isnan(x) ? x : r;
  return r;
}


#define FRACT_DEF(addrspace) \
  _CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fract(__CLC_GENTYPE x, addrspace __CLC_GENTYPE *iptr) { \
    __CLC_GENTYPE private_iptr; \
    __CLC_GENTYPE ret = fract(x, &private_iptr); \
    *iptr = private_iptr; \
    return ret; \
 }

FRACT_DEF(local);
FRACT_DEF(global);

#undef MIN_CONSTANT
#undef ZERO