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glibc  2.9
s_copysign.c
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00001 /* Copyright (C) 2000, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Richard Henderson.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <math.h>
00021 #include <math_ldbl_opt.h>
00022 
00023 double
00024 __copysign (double x, double y)
00025 {
00026   __asm ("cpys %1, %2, %0" : "=f" (x) : "f" (y), "f" (x));
00027   return x;
00028 }
00029 
00030 weak_alias (__copysign, copysign)
00031 #ifdef NO_LONG_DOUBLE
00032 strong_alias (__copysign, __copysignl)
00033 weak_alias (__copysign, copysignl)
00034 #endif
00035 #ifdef IS_IN_libm
00036 # if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
00037 compat_symbol (libm, __copysign, copysignl, GLIBC_2_0);
00038 # endif
00039 #elif LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
00040 compat_symbol (libc, __copysign, copysignl, GLIBC_2_0);
00041 #endif