1  /* Divide long double (ldbl-128) values, narrowing the result to
       2     double, using soft-fp.
       3     Copyright (C) 2018-2023 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 f32xdivf64x __hide_f32xdivf64x
      21  #define f32xdivf128 __hide_f32xdivf128
      22  #define f64divf64x __hide_f64divf64x
      23  #define f64divf128 __hide_f64divf128
      24  #include <math.h>
      25  #undef f32xdivf64x
      26  #undef f32xdivf128
      27  #undef f64divf64x
      28  #undef f64divf128
      29  
      30  #include <math-narrow.h>
      31  #include <libc-diag.h>
      32  
      33  /* R_f[01] are not set in cases where they are not used in packing,
      34     but the compiler does not see that they are set in all cases where
      35     they are used, resulting in warnings that they may be used
      36     uninitialized.  The location of the warning differs in different
      37     versions of GCC, it may be where R is defined using a macro or it
      38     may be where the macro is defined.  This happens only with -O1.  */
      39  DIAG_PUSH_NEEDS_COMMENT;
      40  DIAG_IGNORE_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
      41  #include <soft-fp.h>
      42  #include <double.h>
      43  #include <quad.h>
      44  
      45  double
      46  __ddivl (_Float128 x, _Float128 y)
      47  {
      48    FP_DECL_EX;
      49    FP_DECL_Q (X);
      50    FP_DECL_Q (Y);
      51    FP_DECL_Q (R);
      52    FP_DECL_D (RN);
      53    double ret;
      54  
      55    FP_INIT_ROUNDMODE;
      56    FP_UNPACK_Q (X, x);
      57    FP_UNPACK_Q (Y, y);
      58    FP_DIV_Q (R, X, Y);
      59  #if _FP_W_TYPE_SIZE < 64
      60    FP_TRUNC_COOKED (D, Q, 2, 4, RN, R);
      61  #else
      62    FP_TRUNC_COOKED (D, Q, 1, 2, RN, R);
      63  #endif
      64    FP_PACK_D (ret, RN);
      65    FP_HANDLE_EXCEPTIONS;
      66    CHECK_NARROW_DIV (ret, x, y);
      67    return ret;
      68  }
      69  DIAG_POP_NEEDS_COMMENT;
      70  
      71  libm_alias_double_ldouble (div)