clang  14.0.0git
math.h
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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
limits.h
__clang_hip_math.h
__clang_cuda_math.h