1/*
2 * Copyright (c) 2014 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23#include <clc/clc.h>
24
25#include "math.h"
26#include "sincos_helpers.h"
27#include "../clcmacro.h"
28
29_CLC_OVERLOAD _CLC_DEF float cos(float x)
30{
31    int ix = as_int(x);
32    int ax = ix & 0x7fffffff;
33    float dx = as_float(ax);
34
35    float r0, r1;
36    int regn = __clc_argReductionS(&r0, &r1, dx);
37
38    float ss = -__clc_sinf_piby4(r0, r1);
39    float cc =  __clc_cosf_piby4(r0, r1);
40
41    float c =  (regn & 1) != 0 ? ss : cc;
42    c = as_float(as_int(c) ^ ((regn > 1) << 31));
43
44    c = ax >= PINFBITPATT_SP32 ? as_float(QNANBITPATT_SP32) : c;
45
46    return c;
47}
48
49_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, cos, float);
50
51#ifdef cl_khr_fp64
52
53#pragma OPENCL EXTENSION cl_khr_fp64 : enable
54
55_CLC_OVERLOAD _CLC_DEF double cos(double x) {
56    x = fabs(x);
57
58    double r, rr;
59    int regn;
60
61    if (x < 0x1.0p+47)
62        __clc_remainder_piby2_medium(x, &r, &rr, &regn);
63    else
64        __clc_remainder_piby2_large(x, &r, &rr, &regn);
65
66    double2 sc = __clc_sincos_piby4(r, rr);
67    sc.lo = -sc.lo;
68
69    int2 c = as_int2(regn & 1 ? sc.lo : sc.hi);
70    c.hi ^= (regn > 1) << 31;
71
72    return isnan(x) | isinf(x) ? as_double(QNANBITPATT_DP64) : as_double(c);
73}
74
75_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, cos, double);
76
77#endif
78