1/*
2 * Copyright (c) 2016 Aaron Watry
3 * Copyright (c) 2014 Advanced Micro Devices, Inc.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
24#include <clc/clc.h>
25
26#include "math.h"
27#include "../clcmacro.h"
28
29_CLC_OVERLOAD _CLC_DEF float tgamma(float x) {
30    const float pi = 3.1415926535897932384626433832795f;
31    float ax = fabs(x);
32    float lg = lgamma(ax);
33    float g = exp(lg);
34
35    if (x < 0.0f) {
36        float z = sinpi(x);
37        g = g * ax * z;
38        g = pi / g;
39        g = g == 0 ? as_float(PINFBITPATT_SP32) : g;
40        g = z == 0 ? as_float(QNANBITPATT_SP32) : g;
41    }
42
43    return g;
44}
45
46_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, tgamma, float);
47
48#ifdef cl_khr_fp64
49
50#pragma OPENCL EXTENSION cl_khr_fp64 : enable
51
52_CLC_OVERLOAD _CLC_DEF double tgamma(double x) {
53    const double pi = 3.1415926535897932384626433832795;
54    double ax = fabs(x);
55    double lg = lgamma(ax);
56    double g = exp(lg);
57
58    if (x < 0.0) {
59        double z = sinpi(x);
60        g = g * ax * z;
61        g = pi / g;
62        g = g == 0 ? as_double(PINFBITPATT_DP64) : g;
63        g = z == 0 ? as_double(QNANBITPATT_DP64) : g;
64    }
65
66    return g;
67}
68
69_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, tgamma, double);
70
71#endif
72