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

   1 /* Software floating-point emulation.
   2    scalbnl(x, exp)
   3    Copyright (C) 1999-2016 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  * scalbnl (long double x, int n)
  23  * scalbnl(x,n) returns x* 2**n  computed by  exponent
  24  * manipulation rather than by actually performing an
  25  * exponentiation or a multiplication.
  26  */
  27
  28 #include "soft-fp.h"
  29 #include "quad.h"
  30
  31 long double __scalbnl(long double arg, int exp)
  32 {
  33   FP_DECL_EX;
  34   FP_DECL_Q(A);
  35   long double r;
  36
  37   FP_UNPACK_Q(A, arg);
  38   switch (A_c)
  39     {
  40     case FP_CLS_ZERO:
  41       return arg;
  42     case FP_CLS_NAN:
  43     case FP_CLS_INF:
  44       FP_HANDLE_EXCEPTIONS;
  45       return arg;
  46     }
  47   A_e += exp;
  48   FP_PACK_Q(r, A);
  49   FP_HANDLE_EXCEPTIONS;
  50
  51   return r;
  52 }