sysdeps/sparc/sparc64/soft-fp/s_frexpl.c

   1 /* Software floating-point emulation.
   2    frexpl(x, exp)
   3    Copyright (C) 1999-2017 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Jakub Jelinek (jj@ultra.linux.cz).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 /*
  22  * for non-zero x
  23  *      x = frexpl(arg,&exp);
  24  * return a long double fp quantity x such that 0.5 <= |x| <1.0
  25  * and the corresponding binary exponent "exp". That is
  26  *      arg = x*2^exp.
  27  * If arg is inf, 0.0, or NaN, then frexpl(arg,&exp) returns arg
  28  * with *exp=0.
  29  */
  30
  31 #include "soft-fp.h"
  32 #include "quad.h"
  33
  34 long double __frexpl(long double arg, int *exp)
  35 {
  36   FP_DECL_EX;
  37   FP_DECL_Q(A);
  38   long double r;
  39
  40   *exp = 0;
  41   FP_UNPACK_Q(A, arg);
  42   if (A_c != FP_CLS_NORMAL)
  43     return arg;
  44   *exp = A_e + 1;
  45   A_e = -1;
  46   FP_PACK_Q(r, A);
  47
  48   return r;
  49 }
  50
  51 weak_alias (__frexpl, frexpl)