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70 lines
2.2 KiB
70 lines
2.2 KiB
4 months ago
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/*
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* Copyright (c) 2014, 2015 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 "tables.h"
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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_CLC_DEF double __clc_exp_helper(double x, double x_min, double x_max, double r, int n) {
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int j = n & 0x3f;
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int m = n >> 6;
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// 6 term tail of Taylor expansion of e^r
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double z2 = r * fma(r,
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fma(r,
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fma(r,
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fma(r,
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fma(r, 0x1.6c16c16c16c17p-10, 0x1.1111111111111p-7),
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0x1.5555555555555p-5),
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0x1.5555555555555p-3),
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0x1.0000000000000p-1),
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1.0);
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double2 tv = USE_TABLE(two_to_jby64_ep_tbl, j);
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z2 = fma(tv.s0 + tv.s1, z2, tv.s1) + tv.s0;
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int small_value = (m < -1022) || ((m == -1022) && (z2 < 1.0));
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int n1 = m >> 2;
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int n2 = m-n1;
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double z3= z2 * as_double(((long)n1 + 1023) << 52);
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z3 *= as_double(((long)n2 + 1023) << 52);
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z2 = ldexp(z2, m);
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z2 = small_value ? z3: z2;
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z2 = isnan(x) ? x : z2;
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z2 = x > x_max ? as_double(PINFBITPATT_DP64) : z2;
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z2 = x < x_min ? 0.0 : z2;
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return z2;
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}
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#endif // cl_khr_fp64
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