clang 17.0.0git
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