1  /* Implement fmal using soft-fp.
       2     Copyright (C) 2013-2023 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     <https://www.gnu.org/licenses/>.  */
      27  
      28  #define NO_MATH_REDIRECT
      29  #define f64xfmaf128 __hide_f64xfmaf128
      30  #include <math.h>
      31  #undef f64xfmaf128
      32  #include <libc-diag.h>
      33  #include <libm-alias-ldouble.h>
      34  #include <math-narrow-alias.h>
      35  
      36  /* R_e is not set in cases where it is not used in packing, but the
      37     compiler does not see that it is set in all cases where it is
      38     used, resulting in warnings that it may be used uninitialized.
      39     The location of the warning differs in different versions of GCC,
      40     it may be where R is defined using a macro or it may be where the
      41     macro is defined.  */
      42  DIAG_PUSH_NEEDS_COMMENT;
      43  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized");
      44  
      45  #include "soft-fp.h"
      46  #include "quad.h"
      47  
      48  long double
      49  __fmal (long double a, long double b, long double c)
      50  {
      51    FP_DECL_EX;
      52    FP_DECL_Q (A);
      53    FP_DECL_Q (B);
      54    FP_DECL_Q (C);
      55    FP_DECL_Q (R);
      56    long double r;
      57  
      58    FP_INIT_ROUNDMODE;
      59    FP_UNPACK_Q (A, a);
      60    FP_UNPACK_Q (B, b);
      61    FP_UNPACK_Q (C, c);
      62    FP_FMA_Q (R, A, B, C);
      63    FP_PACK_Q (r, R);
      64    FP_HANDLE_EXCEPTIONS;
      65  
      66    return r;
      67  }
      68  DIAG_POP_NEEDS_COMMENT;
      69  
      70  libm_alias_ldouble (__fma, fma)
      71  libm_alias_ldouble_narrow (__fma, fma)