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glibc  2.9
k_cos.c
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00001 /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <math.h>
00020 #include "math_private.h"
00021 
00022 #ifndef FUNC
00023 #define FUNC cos
00024 #endif
00025 #ifndef float_type
00026 #define float_type double
00027 #endif
00028 
00029 #define __CONCATX(a,b) __CONCAT(a,b)
00030 
00031 float_type
00032 __CONCATX(__kernel_,FUNC) (x, y)
00033      float_type x;
00034      float_type y;
00035 {
00036   float_type sin_x, cos_x, sin_y, cos_y;
00037   __asm__ __volatile__ ("fsincosx %2,%0:%1" : "=f" (cos_x), "=f" (sin_x)
00038                      : "f" (x));
00039   __asm__ __volatile__ ("fsincosx %2,%0:%1" : "=f" (cos_y), "=f" (sin_y)
00040                      : "f" (y));
00041   return cos_x * cos_y - sin_x * sin_y;
00042 }