libclc/amdgpu/lib/math/sqrt.cl

   1 /*
   2  * Copyright (c) 2015 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
  23 #include <clc/clc.h>
  24 #include "../../../generic/lib/clcmacro.h"
  25 #include "math/clc_sqrt.h"
  26
  27 _CLC_DEFINE_UNARY_BUILTIN(float, sqrt, __clc_sqrt, float)
  28
  29 #ifdef cl_khr_fp16
  30
  31 #pragma OPENCL EXTENSION cl_khr_fp16 : enable
  32 _CLC_DEFINE_UNARY_BUILTIN(half, sqrt, __clc_sqrt, half)
  33
  34 #endif
  35
  36 #ifdef cl_khr_fp64
  37
  38 #pragma OPENCL EXTENSION cl_khr_fp64 : enable
  39
  40 #ifdef __AMDGCN__
  41   #define __clc_builtin_rsq __builtin_amdgcn_rsq
  42 #else
  43   #define __clc_builtin_rsq __builtin_r600_recipsqrt_ieee
  44 #endif
  45
  46 _CLC_OVERLOAD _CLC_DEF double sqrt(double x) {
  47
  48   uint vcc = x < 0x1p-767;
  49   uint exp0 = vcc ? 0x100 : 0;
  50   unsigned exp1 = vcc ? 0xffffff80 : 0;
  51
  52   double v01 = ldexp(x, exp0);
  53   double v23 = __clc_builtin_rsq(v01);
  54   double v45 = v01 * v23;
  55   v23 = v23 * 0.5;
  56
  57   double v67 = fma(-v23, v45, 0.5);
  58   v45 = fma(v45, v67, v45);
  59   double v89 = fma(-v45, v45, v01);
  60   v23 = fma(v23, v67, v23);
  61   v45 = fma(v89, v23, v45);
  62   v67 = fma(-v45, v45, v01);
  63   v23 = fma(v67, v23, v45);
  64
  65   v23 = ldexp(v23, exp1);
  66   return ((x == __builtin_inf()) || (x == 0.0)) ? v01 : v23;
  67 }
  68
  69 _CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, sqrt, double);
  70
  71 #endif