clang/lib/Headers/__clang_cuda_complex_builtins.h

   1 /*===-- __clang_cuda_complex_builtins - CUDA impls of runtime complex fns ---===
   2  *
   3  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4  * See https://llvm.org/LICENSE.txt for license information.
   5  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6  *
   7  *===-----------------------------------------------------------------------===
   8  */
   9
  10 #ifndef __CLANG_CUDA_COMPLEX_BUILTINS
  11 #define __CLANG_CUDA_COMPLEX_BUILTINS
  12
  13 // This header defines __muldc3, __mulsc3, __divdc3, and __divsc3.  These are
  14 // libgcc functions that clang assumes are available when compiling c99 complex
  15 // operations.  (These implementations come from libc++, and have been modified
  16 // to work with CUDA and OpenMP target offloading [in C and C++ mode].)
  17
  18 #pragma push_macro("__DEVICE__")
  19 #if defined(__OPENMP_NVPTX__) || defined(__OPENMP_AMDGCN__)
  20 #pragma omp declare target
  21 #define __DEVICE__ __attribute__((noinline, nothrow, cold, weak))
  22 #else
  23 #define __DEVICE__ __device__ inline
  24 #endif
  25
  26 // To make the algorithms available for C and C++ in CUDA and OpenMP we select
  27 // different but equivalent function versions. TODO: For OpenMP we currently
  28 // select the native builtins as the overload support for templates is lacking.
  29 #if !defined(__OPENMP_NVPTX__) && !defined(__OPENMP_AMDGCN__)
  30 #define _ISNANd std::isnan
  31 #define _ISNANf std::isnan
  32 #define _ISINFd std::isinf
  33 #define _ISINFf std::isinf
  34 #define _ISFINITEd std::isfinite
  35 #define _ISFINITEf std::isfinite
  36 #define _COPYSIGNd std::copysign
  37 #define _COPYSIGNf std::copysign
  38 #define _SCALBNd std::scalbn
  39 #define _SCALBNf std::scalbn
  40 #define _ABSd std::abs
  41 #define _ABSf std::abs
  42 #define _LOGBd std::logb
  43 #define _LOGBf std::logb
  44 // Rather than pulling in std::max from algorithm everytime, use available ::max.
  45 #define _fmaxd max
  46 #define _fmaxf max
  47 #else
  48 #ifdef __AMDGCN__
  49 #define _ISNANd __ocml_isnan_f64
  50 #define _ISNANf __ocml_isnan_f32
  51 #define _ISINFd __ocml_isinf_f64
  52 #define _ISINFf __ocml_isinf_f32
  53 #define _ISFINITEd __ocml_isfinite_f64
  54 #define _ISFINITEf __ocml_isfinite_f32
  55 #define _COPYSIGNd __ocml_copysign_f64
  56 #define _COPYSIGNf __ocml_copysign_f32
  57 #define _SCALBNd __ocml_scalbn_f64
  58 #define _SCALBNf __ocml_scalbn_f32
  59 #define _ABSd __ocml_fabs_f64
  60 #define _ABSf __ocml_fabs_f32
  61 #define _LOGBd __ocml_logb_f64
  62 #define _LOGBf __ocml_logb_f32
  63 #define _fmaxd __ocml_fmax_f64
  64 #define _fmaxf __ocml_fmax_f32
  65 #else
  66 #define _ISNANd __nv_isnand
  67 #define _ISNANf __nv_isnanf
  68 #define _ISINFd __nv_isinfd
  69 #define _ISINFf __nv_isinff
  70 #define _ISFINITEd __nv_isfinited
  71 #define _ISFINITEf __nv_finitef
  72 #define _COPYSIGNd __nv_copysign
  73 #define _COPYSIGNf __nv_copysignf
  74 #define _SCALBNd __nv_scalbn
  75 #define _SCALBNf __nv_scalbnf
  76 #define _ABSd __nv_fabs
  77 #define _ABSf __nv_fabsf
  78 #define _LOGBd __nv_logb
  79 #define _LOGBf __nv_logbf
  80 #define _fmaxd __nv_fmax
  81 #define _fmaxf __nv_fmaxf
  82 #endif
  83 #endif
  84
  85 #if defined(__cplusplus)
  86 extern "C" {
  87 #endif
  88
  89 __DEVICE__ double _Complex __muldc3(double __a, double __b, double __c,
  90                                     double __d) {
  91   double __ac = __a * __c;
  92   double __bd = __b * __d;
  93   double __ad = __a * __d;
  94   double __bc = __b * __c;
  95   double _Complex z;
  96   __real__(z) = __ac - __bd;
  97   __imag__(z) = __ad + __bc;
  98   if (_ISNANd(__real__(z)) && _ISNANd(__imag__(z))) {
  99     int __recalc = 0;
 100     if (_ISINFd(__a) || _ISINFd(__b)) {
 101       __a = _COPYSIGNd(_ISINFd(__a) ? 1 : 0, __a);
 102       __b = _COPYSIGNd(_ISINFd(__b) ? 1 : 0, __b);
 103       if (_ISNANd(__c))
 104         __c = _COPYSIGNd(0, __c);
 105       if (_ISNANd(__d))
 106         __d = _COPYSIGNd(0, __d);
 107       __recalc = 1;
 108     }
 109     if (_ISINFd(__c) || _ISINFd(__d)) {
 110       __c = _COPYSIGNd(_ISINFd(__c) ? 1 : 0, __c);
 111       __d = _COPYSIGNd(_ISINFd(__d) ? 1 : 0, __d);
 112       if (_ISNANd(__a))
 113         __a = _COPYSIGNd(0, __a);
 114       if (_ISNANd(__b))
 115         __b = _COPYSIGNd(0, __b);
 116       __recalc = 1;
 117     }
 118     if (!__recalc &&
 119         (_ISINFd(__ac) || _ISINFd(__bd) || _ISINFd(__ad) || _ISINFd(__bc))) {
 120       if (_ISNANd(__a))
 121         __a = _COPYSIGNd(0, __a);
 122       if (_ISNANd(__b))
 123         __b = _COPYSIGNd(0, __b);
 124       if (_ISNANd(__c))
 125         __c = _COPYSIGNd(0, __c);
 126       if (_ISNANd(__d))
 127         __d = _COPYSIGNd(0, __d);
 128       __recalc = 1;
 129     }
 130     if (__recalc) {
 131       // Can't use std::numeric_limits<double>::infinity() -- that doesn't have
 132       // a device overload (and isn't constexpr before C++11, naturally).
 133       __real__(z) = __builtin_huge_val() * (__a * __c - __b * __d);
 134       __imag__(z) = __builtin_huge_val() * (__a * __d + __b * __c);
 135     }
 136   }
 137   return z;
 138 }
 139
 140 __DEVICE__ float _Complex __mulsc3(float __a, float __b, float __c, float __d) {
 141   float __ac = __a * __c;
 142   float __bd = __b * __d;
 143   float __ad = __a * __d;
 144   float __bc = __b * __c;
 145   float _Complex z;
 146   __real__(z) = __ac - __bd;
 147   __imag__(z) = __ad + __bc;
 148   if (_ISNANf(__real__(z)) && _ISNANf(__imag__(z))) {
 149     int __recalc = 0;
 150     if (_ISINFf(__a) || _ISINFf(__b)) {
 151       __a = _COPYSIGNf(_ISINFf(__a) ? 1 : 0, __a);
 152       __b = _COPYSIGNf(_ISINFf(__b) ? 1 : 0, __b);
 153       if (_ISNANf(__c))
 154         __c = _COPYSIGNf(0, __c);
 155       if (_ISNANf(__d))
 156         __d = _COPYSIGNf(0, __d);
 157       __recalc = 1;
 158     }
 159     if (_ISINFf(__c) || _ISINFf(__d)) {
 160       __c = _COPYSIGNf(_ISINFf(__c) ? 1 : 0, __c);
 161       __d = _COPYSIGNf(_ISINFf(__d) ? 1 : 0, __d);
 162       if (_ISNANf(__a))
 163         __a = _COPYSIGNf(0, __a);
 164       if (_ISNANf(__b))
 165         __b = _COPYSIGNf(0, __b);
 166       __recalc = 1;
 167     }
 168     if (!__recalc &&
 169         (_ISINFf(__ac) || _ISINFf(__bd) || _ISINFf(__ad) || _ISINFf(__bc))) {
 170       if (_ISNANf(__a))
 171         __a = _COPYSIGNf(0, __a);
 172       if (_ISNANf(__b))
 173         __b = _COPYSIGNf(0, __b);
 174       if (_ISNANf(__c))
 175         __c = _COPYSIGNf(0, __c);
 176       if (_ISNANf(__d))
 177         __d = _COPYSIGNf(0, __d);
 178       __recalc = 1;
 179     }
 180     if (__recalc) {
 181       __real__(z) = __builtin_huge_valf() * (__a * __c - __b * __d);
 182       __imag__(z) = __builtin_huge_valf() * (__a * __d + __b * __c);
 183     }
 184   }
 185   return z;
 186 }
 187
 188 __DEVICE__ double _Complex __divdc3(double __a, double __b, double __c,
 189                                     double __d) {
 190   int __ilogbw = 0;
 191   // Can't use std::max, because that's defined in <algorithm>, and we don't
 192   // want to pull that in for every compile.  The CUDA headers define
 193   // ::max(float, float) and ::max(double, double), which is sufficient for us.
 194   double __logbw = _LOGBd(_fmaxd(_ABSd(__c), _ABSd(__d)));
 195   if (_ISFINITEd(__logbw)) {
 196     __ilogbw = (int)__logbw;
 197     __c = _SCALBNd(__c, -__ilogbw);
 198     __d = _SCALBNd(__d, -__ilogbw);
 199   }
 200   double __denom = __c * __c + __d * __d;
 201   double _Complex z;
 202   __real__(z) = _SCALBNd((__a * __c + __b * __d) / __denom, -__ilogbw);
 203   __imag__(z) = _SCALBNd((__b * __c - __a * __d) / __denom, -__ilogbw);
 204   if (_ISNANd(__real__(z)) && _ISNANd(__imag__(z))) {
 205     if ((__denom == 0.0) && (!_ISNANd(__a) || !_ISNANd(__b))) {
 206       __real__(z) = _COPYSIGNd(__builtin_huge_val(), __c) * __a;
 207       __imag__(z) = _COPYSIGNd(__builtin_huge_val(), __c) * __b;
 208     } else if ((_ISINFd(__a) || _ISINFd(__b)) && _ISFINITEd(__c) &&
 209                _ISFINITEd(__d)) {
 210       __a = _COPYSIGNd(_ISINFd(__a) ? 1.0 : 0.0, __a);
 211       __b = _COPYSIGNd(_ISINFd(__b) ? 1.0 : 0.0, __b);
 212       __real__(z) = __builtin_huge_val() * (__a * __c + __b * __d);
 213       __imag__(z) = __builtin_huge_val() * (__b * __c - __a * __d);
 214     } else if (_ISINFd(__logbw) && __logbw > 0.0 && _ISFINITEd(__a) &&
 215                _ISFINITEd(__b)) {
 216       __c = _COPYSIGNd(_ISINFd(__c) ? 1.0 : 0.0, __c);
 217       __d = _COPYSIGNd(_ISINFd(__d) ? 1.0 : 0.0, __d);
 218       __real__(z) = 0.0 * (__a * __c + __b * __d);
 219       __imag__(z) = 0.0 * (__b * __c - __a * __d);
 220     }
 221   }
 222   return z;
 223 }
 224
 225 __DEVICE__ float _Complex __divsc3(float __a, float __b, float __c, float __d) {
 226   int __ilogbw = 0;
 227   float __logbw = _LOGBf(_fmaxf(_ABSf(__c), _ABSf(__d)));
 228   if (_ISFINITEf(__logbw)) {
 229     __ilogbw = (int)__logbw;
 230     __c = _SCALBNf(__c, -__ilogbw);
 231     __d = _SCALBNf(__d, -__ilogbw);
 232   }
 233   float __denom = __c * __c + __d * __d;
 234   float _Complex z;
 235   __real__(z) = _SCALBNf((__a * __c + __b * __d) / __denom, -__ilogbw);
 236   __imag__(z) = _SCALBNf((__b * __c - __a * __d) / __denom, -__ilogbw);
 237   if (_ISNANf(__real__(z)) && _ISNANf(__imag__(z))) {
 238     if ((__denom == 0) && (!_ISNANf(__a) || !_ISNANf(__b))) {
 239       __real__(z) = _COPYSIGNf(__builtin_huge_valf(), __c) * __a;
 240       __imag__(z) = _COPYSIGNf(__builtin_huge_valf(), __c) * __b;
 241     } else if ((_ISINFf(__a) || _ISINFf(__b)) && _ISFINITEf(__c) &&
 242                _ISFINITEf(__d)) {
 243       __a = _COPYSIGNf(_ISINFf(__a) ? 1 : 0, __a);
 244       __b = _COPYSIGNf(_ISINFf(__b) ? 1 : 0, __b);
 245       __real__(z) = __builtin_huge_valf() * (__a * __c + __b * __d);
 246       __imag__(z) = __builtin_huge_valf() * (__b * __c - __a * __d);
 247     } else if (_ISINFf(__logbw) && __logbw > 0 && _ISFINITEf(__a) &&
 248                _ISFINITEf(__b)) {
 249       __c = _COPYSIGNf(_ISINFf(__c) ? 1 : 0, __c);
 250       __d = _COPYSIGNf(_ISINFf(__d) ? 1 : 0, __d);
 251       __real__(z) = 0 * (__a * __c + __b * __d);
 252       __imag__(z) = 0 * (__b * __c - __a * __d);
 253     }
 254   }
 255   return z;
 256 }
 257
 258 #if defined(__cplusplus)
 259 } // extern "C"
 260 #endif
 261
 262 #undef _ISNANd
 263 #undef _ISNANf
 264 #undef _ISINFd
 265 #undef _ISINFf
 266 #undef _COPYSIGNd
 267 #undef _COPYSIGNf
 268 #undef _ISFINITEd
 269 #undef _ISFINITEf
 270 #undef _SCALBNd
 271 #undef _SCALBNf
 272 #undef _ABSd
 273 #undef _ABSf
 274 #undef _LOGBd
 275 #undef _LOGBf
 276 #undef _fmaxd
 277 #undef _fmaxf
 278
 279 #if defined(__OPENMP_NVPTX__) || defined(__OPENMP_AMDGCN__)
 280 #pragma omp end declare target
 281 #endif
 282
 283 #pragma pop_macro("__DEVICE__")
 284
 285 #endif // __CLANG_CUDA_COMPLEX_BUILTINS