Back to index

glibc  2.9
s_fabs.c
Go to the documentation of this file.
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 __fabs (double x)
00025 {
00026 #if __GNUC_PREREQ (2, 8)
00027   return __builtin_fabs (x);
00028 #else
00029   __asm ("cpys $f31, %1, %0" : "=f" (x) : "f" (x));
00030   return x;
00031 #endif
00032 }
00033 
00034 weak_alias (__fabs, fabs)
00035 #ifdef NO_LONG_DOUBLE
00036 strong_alias (__fabs, __fabsl)
00037 weak_alias (__fabs, fabsl)
00038 #endif
00039 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
00040 compat_symbol (libm, __fabs, fabsl, GLIBC_2_0);
00041 #endif