amd-builtins/math32/cosF.cl

/*
 * Copyright (c) 2014 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 1
#include "math32.h"
#include "remainderF_piby2.h"
#include "sincosF_piby4.h"
//#else
//extern __attribute__((pure)) float __amdil_cos_f32(float);
#endif

__attribute__((overloadable, pure)) float
cos(float x)
{
#if 1
    int ix = as_int(x);
    int ax = ix & 0x7fffffff;
    float dx = as_float(ax);

    float r0, r1;
    int regn = argReductionS(&r0, &r1, dx);

    float ss = -sinf_piby4_new(r0, r1);
    float cc =  cosf_piby4_new(r0, r1);

    float c =  (regn & 1) != 0 ? ss : cc;
    c = as_float(as_int(c) ^ ((regn > 1) << 31));

    c = ax >= PINFBITPATT_SP32 ? as_float(QNANBITPATT_SP32) : c;

    return c;
#else
  // TODO_HSA: Using native_cos for now.
  return native_cos(x);
#endif
}