soft-fp/fmatf4.c

   1 /* Implement fmal using soft-fp.
   2    Copyright (C) 2013-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    In addition to the permissions in the GNU Lesser General Public
  11    License, the Free Software Foundation gives you unlimited
  12    permission to link the compiled version of this file into
  13    combinations with other programs, and to distribute those
  14    combinations without any restriction coming from the use of this
  15    file.  (The Lesser General Public License restrictions do apply in
  16    other respects; for example, they cover modification of the file,
  17    and distribution when not linked into a combine executable.)
  18
  19    The GNU C Library is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  22    Lesser General Public License for more details.
  23
  24    You should have received a copy of the GNU Lesser General Public
  25    License along with the GNU C Library; if not, see
  26    <http://www.gnu.org/licenses/>.  */
  27
  28 #include <math.h>
  29 #include <libc-diag.h>
  30 #include <libm-alias-ldouble.h>
  31
  32 /* R_e is not set in cases where it is not used in packing, but the
  33    compiler does not see that it is set in all cases where it is
  34    used, resulting in warnings that it may be used uninitialized.
  35    The location of the warning differs in different versions of GCC,
  36    it may be where R is defined using a macro or it may be where the
  37    macro is defined.  */
  38 DIAG_PUSH_NEEDS_COMMENT;
  39 DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized");
  40
  41 #include "soft-fp.h"
  42 #include "quad.h"
  43
  44 long double
  45 __fmal (long double a, long double b, long double c)
  46 {
  47   FP_DECL_EX;
  48   FP_DECL_Q (A);
  49   FP_DECL_Q (B);
  50   FP_DECL_Q (C);
  51   FP_DECL_Q (R);
  52   long double r;
  53
  54   FP_INIT_ROUNDMODE;
  55   FP_UNPACK_Q (A, a);
  56   FP_UNPACK_Q (B, b);
  57   FP_UNPACK_Q (C, c);
  58   FP_FMA_Q (R, A, B, C);
  59   FP_PACK_Q (r, R);
  60   FP_HANDLE_EXCEPTIONS;
  61
  62   return r;
  63 }
  64 DIAG_POP_NEEDS_COMMENT;
  65
  66 libm_alias_ldouble (__fma, fma)