1  /* Fused multiply-add of long double (ldbl-128) values, narrowing the result to
       2     double, using soft-fp.
       3     Copyright (C) 2021-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #define f32xfmaf64x __hide_f32xfmaf64x
      21  #define f32xfmaf128 __hide_f32xfmaf128
      22  #define f64fmaf64x __hide_f64fmaf64x
      23  #define f64fmaf128 __hide_f64fmaf128
      24  #include <math.h>
      25  #undef f32xfmaf64x
      26  #undef f32xfmaf128
      27  #undef f64fmaf64x
      28  #undef f64fmaf128
      29  
      30  #include <math-narrow.h>
      31  #include <libc-diag.h>
      32  
      33  /* R_e is not set in cases where it is not used in packing, but the
      34     compiler does not see that it is set in all cases where it is
      35     used, resulting in warnings that it may be used uninitialized.
      36     The location of the warning differs in different versions of GCC,
      37     it may be where R is defined using a macro or it may be where the
      38     macro is defined.  */
      39  DIAG_PUSH_NEEDS_COMMENT;
      40  DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wmaybe-uninitialized");
      41  
      42  #include <soft-fp.h>
      43  #include <double.h>
      44  #include <quad.h>
      45  
      46  double
      47  __dfmal (_Float128 x, _Float128 y, _Float128 z)
      48  {
      49    FP_DECL_EX;
      50    FP_DECL_Q (X);
      51    FP_DECL_Q (Y);
      52    FP_DECL_Q (Z);
      53    FP_DECL_Q (R);
      54    FP_DECL_D (RN);
      55    double ret;
      56  
      57    FP_INIT_ROUNDMODE;
      58    FP_UNPACK_Q (X, x);
      59    FP_UNPACK_Q (Y, y);
      60    FP_UNPACK_Q (Z, z);
      61    FP_FMA_Q (R, X, Y, Z);
      62  #if _FP_W_TYPE_SIZE < 64
      63    FP_TRUNC_COOKED (D, Q, 2, 4, RN, R);
      64  #else
      65    FP_TRUNC_COOKED (D, Q, 1, 2, RN, R);
      66  #endif
      67    FP_PACK_D (ret, RN);
      68    FP_HANDLE_EXCEPTIONS;
      69    CHECK_NARROW_FMA (ret, x, y, z);
      70    return ret;
      71  }
      72  DIAG_POP_NEEDS_COMMENT;
      73  
      74  libm_alias_double_ldouble (fma)