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glibc  2.9
s_frexpl.c
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00001 /* Software floating-point emulation.
00002    frexpl(x, exp)
00003    Copyright (C) 1999 Free Software Foundation, Inc.
00004    This file is part of the GNU C Library.
00005    Contributed by 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 /*
00023  * for non-zero x
00024  *      x = frexpl(arg,&exp);
00025  * return a long double fp quantity x such that 0.5 <= |x| <1.0
00026  * and the corresponding binary exponent "exp". That is
00027  *      arg = x*2^exp.
00028  * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
00029  * with *exp=0.
00030  */       
00031 
00032 #include "soft-fp.h"
00033 #include "quad.h"
00034 
00035 long double __frexpl(long double arg, int *exp)
00036 {
00037   FP_DECL_EX;
00038   FP_DECL_Q(A);
00039   long double r;
00040 
00041   *exp = 0;
00042   FP_UNPACK_Q(A, arg);
00043   if (A_c != FP_CLS_NORMAL)
00044     return arg;
00045   *exp = A_e + 1;
00046   A_e = -1;
00047   FP_PACK_Q(r, A);
00048 
00049   return r;
00050 }
00051 
00052 weak_alias (__frexpl, frexpl)