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72 lines
2.2 KiB
72 lines
2.2 KiB
/*
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* Copyright (c) 2016 Aaron Watry
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* Copyright (c) 2014 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <clc/clc.h>
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#include "math.h"
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#include "../clcmacro.h"
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_CLC_OVERLOAD _CLC_DEF float tgamma(float x) {
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const float pi = 3.1415926535897932384626433832795f;
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float ax = fabs(x);
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float lg = lgamma(ax);
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float g = exp(lg);
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if (x < 0.0f) {
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float z = sinpi(x);
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g = g * ax * z;
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g = pi / g;
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g = g == 0 ? as_float(PINFBITPATT_SP32) : g;
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g = z == 0 ? as_float(QNANBITPATT_SP32) : g;
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}
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return g;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, tgamma, float);
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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_CLC_OVERLOAD _CLC_DEF double tgamma(double x) {
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const double pi = 3.1415926535897932384626433832795;
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double ax = fabs(x);
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double lg = lgamma(ax);
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double g = exp(lg);
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if (x < 0.0) {
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double z = sinpi(x);
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g = g * ax * z;
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g = pi / g;
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g = g == 0 ? as_double(PINFBITPATT_DP64) : g;
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g = z == 0 ? as_double(QNANBITPATT_DP64) : g;
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}
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return g;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, tgamma, double);
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#endif
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