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glibc  2.9
e_sqrtl.c
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00001 /* long double square root in software floating-point emulation.
00002    Copyright (C) 1997, 1999, 2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Richard Henderson (rth@cygnus.com) and
00005                 Jakub Jelinek (jj@ultra.linux.cz).
00006 
00007    The GNU C Library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Lesser General Public
00009    License as published by the Free Software Foundation; either
00010    version 2.1 of the License, or (at your option) any later version.
00011 
00012    The GNU C Library is distributed in the hope that it will be useful,
00013    but WITHOUT ANY WARRANTY; without even the implied warranty of
00014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015    Lesser General Public License for more details.
00016 
00017    You should have received a copy of the GNU Lesser General Public
00018    License along with the GNU C Library; if not, write to the Free
00019    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00020    02111-1307 USA.  */
00021 
00022 #include <stdlib.h>
00023 #include <soft-fp.h>
00024 #include <quad.h>
00025 
00026 long double
00027 __ieee754_sqrtl (const long double a)
00028 {
00029   FP_DECL_EX;
00030   FP_DECL_Q(A); FP_DECL_Q(C);
00031   long double c;
00032 
00033   FP_INIT_ROUNDMODE;
00034   FP_UNPACK_Q(A, a);
00035   FP_SQRT_Q(C, A);
00036   FP_PACK_Q(c, C);
00037   FP_HANDLE_EXCEPTIONS;
00038   return c;
00039 }