clang/lib/Headers/openmp_wrappers/math.h

   1 /*===---- openmp_wrapper/math.h -------- OpenMP math.h intercept ------ c++ -===
   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 // If we are in C++ mode and include <math.h> (not <cmath>) first, we still need
  11 // to make sure <cmath> is read first. The problem otherwise is that we haven't
  12 // seen the declarations of the math.h functions when the system math.h includes
  13 // our cmath overlay. However, our cmath overlay, or better the underlying
  14 // overlay, e.g. CUDA, uses the math.h functions. Since we haven't declared them
  15 // yet we get errors. CUDA avoids this by eagerly declaring all math functions
  16 // (in the __device__ space) but we cannot do this. Instead we break the
  17 // dependence by forcing cmath to go first. While our cmath will in turn include
  18 // this file, the cmath guards will prevent recursion.
  19 #ifdef __cplusplus
  20 #include <cmath>
  21 #endif
  22
  23 #ifndef __CLANG_OPENMP_MATH_H__
  24 #define __CLANG_OPENMP_MATH_H__
  25
  26 #ifndef _OPENMP
  27 #error "This file is for OpenMP compilation only."
  28 #endif
  29
  30 #include_next <math.h>
  31
  32 // We need limits.h for __clang_cuda_math.h below and because it should not hurt
  33 // we include it eagerly here.
  34 #include <limits.h>
  35
  36 // We need stdlib.h because (for now) __clang_cuda_math.h below declares `abs`
  37 // which should live in stdlib.h.
  38 #include <stdlib.h>
  39
  40 #pragma omp begin declare variant match(                                       \
  41     device = {arch(nvptx, nvptx64)}, implementation = {extension(match_any)})
  42
  43 #define __CUDA__
  44 #define __OPENMP_NVPTX__
  45 #include <__clang_cuda_math.h>
  46 #undef __OPENMP_NVPTX__
  47 #undef __CUDA__
  48
  49 #pragma omp end declare variant
  50
  51 #ifdef __AMDGCN__
  52 #pragma omp begin declare variant match(device = {arch(amdgcn)})
  53
  54 #define __OPENMP_AMDGCN__
  55 #include <__clang_hip_math.h>
  56 #undef __OPENMP_AMDGCN__
  57
  58 #pragma omp end declare variant
  59 #endif
  60
  61 #endif