soft-fp/trunctfxf2.c

   1 /* Software floating-point emulation.
   2    Truncate IEEE quad into IEEE extended
   3    Copyright (C) 2007-2017 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Uros Bizjak (ubizjak@gmail.com).
   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    In addition to the permissions in the GNU Lesser General Public
  13    License, the Free Software Foundation gives you unlimited
  14    permission to link the compiled version of this file into
  15    combinations with other programs, and to distribute those
  16    combinations without any restriction coming from the use of this
  17    file.  (The Lesser General Public License restrictions do apply in
  18    other respects; for example, they cover modification of the file,
  19    and distribution when not linked into a combine executable.)
  20
  21    The GNU C Library is distributed in the hope that it will be useful,
  22    but WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24    Lesser General Public License for more details.
  25
  26    You should have received a copy of the GNU Lesser General Public
  27    License along with the GNU C Library; if not, see
  28    <http://www.gnu.org/licenses/>.  */
  29
  30 #include "soft-fp.h"
  31 #include "extended.h"
  32 #include "quad.h"
  33
  34 XFtype
  35 __trunctfxf2 (TFtype a)
  36 {
  37   FP_DECL_EX;
  38   FP_DECL_Q (A);
  39   FP_DECL_E (R);
  40   XFtype r;
  41
  42   FP_INIT_ROUNDMODE;
  43   FP_UNPACK_SEMIRAW_Q (A, a);
  44 #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
  45   FP_TRUNC (E, Q, 4, 4, R, A);
  46 #else
  47   FP_TRUNC (E, Q, 2, 2, R, A);
  48 #endif
  49   FP_PACK_SEMIRAW_E (r, R);
  50   FP_HANDLE_EXCEPTIONS;
  51
  52   return r;
  53 }