晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/bits/math-vector.h
/* Platform-specific SIMD declarations of math functions.
   Copyright (C) 2014-2018 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")
# elif __GNUC_PREREQ (6,0)
/* W/o OpenMP use GCC 6.* __attribute__ ((__simd__)).  */
#  define __DECL_SIMD_x86_64 __attribute__ ((__simd__ ("notinbranch")))
# endif

# ifdef __DECL_SIMD_x86_64
#  undef __DECL_SIMD_cos
#  define __DECL_SIMD_cos __DECL_SIMD_x86_64
#  undef __DECL_SIMD_cosf
#  define __DECL_SIMD_cosf __DECL_SIMD_x86_64
#  undef __DECL_SIMD_sin
#  define __DECL_SIMD_sin __DECL_SIMD_x86_64
#  undef __DECL_SIMD_sinf
#  define __DECL_SIMD_sinf __DECL_SIMD_x86_64
#  undef __DECL_SIMD_sincos
#  define __DECL_SIMD_sincos __DECL_SIMD_x86_64
#  undef __DECL_SIMD_sincosf
#  define __DECL_SIMD_sincosf __DECL_SIMD_x86_64
#  undef __DECL_SIMD_log
#  define __DECL_SIMD_log __DECL_SIMD_x86_64
#  undef __DECL_SIMD_logf
#  define __DECL_SIMD_logf __DECL_SIMD_x86_64
#  undef __DECL_SIMD_exp
#  define __DECL_SIMD_exp __DECL_SIMD_x86_64
#  undef __DECL_SIMD_expf
#  define __DECL_SIMD_expf __DECL_SIMD_x86_64
#  undef __DECL_SIMD_pow
#  define __DECL_SIMD_pow __DECL_SIMD_x86_64
#  undef __DECL_SIMD_powf
#  define __DECL_SIMD_powf __DECL_SIMD_x86_64

# endif
#endif

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