libclc/generic/lib/math/clc_tan.cl

   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 #include <clc/clc.h>
  23
  24 #include "math.h"
  25 #include "sincos_helpers.h"
  26 #include "../clcmacro.h"
  27 #include "tables.h"
  28
  29 _CLC_DEF _CLC_OVERLOAD float __clc_tan(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 t = __clc_tanf_piby4(r0 + r1, regn);
  39     t = as_float(as_int(t) ^ (ix ^ ax));
  40
  41     t = ax >= PINFBITPATT_SP32 ? as_float(QNANBITPATT_SP32) : t;
  42     //Take care of subnormals
  43     t = (x == 0.0f) ? x : t;
  44     return t;
  45 }
  46 _CLC_UNARY_VECTORIZE(_CLC_DEF _CLC_OVERLOAD, float, __clc_tan, float);
  47
  48 #ifdef cl_khr_fp64
  49 #include "sincosD_piby4.h"
  50
  51 _CLC_DEF _CLC_OVERLOAD double __clc_tan(double x)
  52 {
  53     double y = fabs(x);
  54
  55     double r, rr;
  56     int regn;
  57
  58     if (y < 0x1.0p+30)
  59         __clc_remainder_piby2_medium(y, &r, &rr, &regn);
  60     else
  61         __clc_remainder_piby2_large(y, &r, &rr, &regn);
  62
  63     double2 tt = __clc_tan_piby4(r, rr);
  64
  65     int2 t = as_int2(regn & 1 ? tt.y : tt.x);
  66     t.hi ^= (x < 0.0) << 31;
  67
  68     return isnan(x) || isinf(x) ? as_double(QNANBITPATT_DP64) : as_double(t);
  69 }
  70 _CLC_UNARY_VECTORIZE(_CLC_DEF _CLC_OVERLOAD, double, __clc_tan, double);
  71 #endif