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Re: [PATCH 1/14] [x86_64] Vector math functions (vector cos)
- From: Szabolcs Nagy <szabolcs dot nagy at arm dot com>
- To: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>, Joseph Myers <joseph at codesourcery dot com>
- Cc: libc-alpha <libc-alpha at sourceware dot org>
- Date: Fri, 15 May 2015 17:46:25 +0100
- Subject: Re: [PATCH 1/14] [x86_64] Vector math functions (vector cos)
- Authentication-results: sourceware.org; auth=none
- References: <CAMXFM3t+v7zYEmvWQxV9aRmJB6Ag2hQgQ56cZJTDy=siRBszDw at mail dot gmail dot com> <alpine dot DEB dot 2 dot 10 dot 1504301541120 dot 23221 at digraph dot polyomino dot org dot uk> <CAMXFM3sVJ6vkEF7RqrrHczJSdF_-gr9Xog-zFcG3rjhOqgqjDw at mail dot gmail dot com>
On 15/05/15 16:34, Andrew Senkevich wrote:
> diff --git a/sysdeps/x86/fpu/bits/math-vector.h b/sysdeps/x86/fpu/bits/math-vector.h
> new file mode 100644
> index 0000000..27294ce
> --- /dev/null
> +++ b/sysdeps/x86/fpu/bits/math-vector.h
> @@ -0,0 +1,34 @@
> +/* Platform-specific SIMD declarations of math functions.
> + Copyright (C) 2014-2015 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +#ifndef _MATH_H
> +# error "Never include <bits/math-vector.h> directly;\
> + include <math.h> instead."
> +#endif
> +
> +/* Get default empty definitions for simd declarations. */
> +#include <bits/libm-simd-decl-stubs.h>
> +
> +#if defined __x86_64__ && defined __FAST_MATH__
> +# if defined _OPENMP && _OPENMP >= 201307
> +/* OpenMP case. */
> +# define __DECL_SIMD_x86_64 _Pragma ("omp declare simd notinbranch")
> +# undef __DECL_SIMD_cos
> +# define __DECL_SIMD_cos __DECL_SIMD_x86_64
> +# endif
> +#endif
why does math.h have #ifdef _OPENMP ? (and __FAST_MATH__)
can this be implemented in an openmp runtime instead?