52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*===---- openmp_wrapper/math.h -------- OpenMP math.h intercept ------ c++ -===
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*
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*===-----------------------------------------------------------------------===
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*/
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// If we are in C++ mode and include <math.h> (not <cmath>) first, we still need
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// to make sure <cmath> is read first. The problem otherwise is that we haven't
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// seen the declarations of the math.h functions when the system math.h includes
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// our cmath overlay. However, our cmath overlay, or better the underlying
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// overlay, e.g. CUDA, uses the math.h functions. Since we haven't declared them
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// yet we get errors. CUDA avoids this by eagerly declaring all math functions
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// (in the __device__ space) but we cannot do this. Instead we break the
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// dependence by forcing cmath to go first. While our cmath will in turn include
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// this file, the cmath guards will prevent recursion.
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#ifdef __cplusplus
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#include <cmath>
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#endif
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#ifndef __CLANG_OPENMP_MATH_H__
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#define __CLANG_OPENMP_MATH_H__
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#ifndef _OPENMP
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#error "This file is for OpenMP compilation only."
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#endif
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#include_next <math.h>
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// We need limits.h for __clang_cuda_math.h below and because it should not hurt
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// we include it eagerly here.
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#include <limits.h>
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// We need stdlib.h because (for now) __clang_cuda_math.h below declares `abs`
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// which should live in stdlib.h.
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#include <stdlib.h>
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#pragma omp begin declare variant match( \
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device = {arch(nvptx, nvptx64)}, implementation = {extension(match_any)})
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#define __CUDA__
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#define __OPENMP_NVPTX__
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#include <__clang_cuda_math.h>
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#undef __OPENMP_NVPTX__
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#undef __CUDA__
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#pragma omp end declare variant
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#endif
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