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/*
* Copyright (c) 2016 Aaron Watry
* 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.
*/
#include <clc/clc.h>
#include "math.h"
#include "../clcmacro.h"
_CLC_OVERLOAD _CLC_DEF float tgamma(float x) {
const float pi = 3.1415926535897932384626433832795f;
float ax = fabs(x);
float lg = lgamma(ax);
float g = exp(lg);
if (x < 0.0f) {
float z = sinpi(x);
g = g * ax * z;
g = pi / g;
g = g == 0 ? as_float(PINFBITPATT_SP32) : g;
g = z == 0 ? as_float(QNANBITPATT_SP32) : g;
}
return g;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, tgamma, float);
#ifdef cl_khr_fp64
#pragma OPENCL EXTENSION cl_khr_fp64 : enable
_CLC_OVERLOAD _CLC_DEF double tgamma(double x) {
const double pi = 3.1415926535897932384626433832795;
double ax = fabs(x);
double lg = lgamma(ax);
double g = exp(lg);
if (x < 0.0) {
double z = sinpi(x);
g = g * ax * z;
g = pi / g;
g = g == 0 ? as_double(PINFBITPATT_DP64) : g;
g = z == 0 ? as_double(QNANBITPATT_DP64) : g;
}
return g;
}
_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, tgamma, double);
#endif
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