1  /* Divide long double (ldbl-128) values, narrowing the result to
       2     float, 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 f32divf64x __hide_f32divf64x
      21  #define f32divf128 __hide_f32divf128
      22  #include <math.h>
      23  #undef f32divf64x
      24  #undef f32divf128
      25  
      26  #include <math-narrow.h>
      27  #include <libc-diag.h>
      28  
      29  /* R_f[01] are not set in cases where they are not used in packing,
      30     but the compiler does not see that they are set in all cases where
      31     they are used, resulting in warnings that they may be used
      32     uninitialized.  The location of the warning differs in different
      33     versions of GCC, it may be where R is defined using a macro or it
      34     may be where the macro is defined.  This happens only with -O1.  */
      35  DIAG_PUSH_NEEDS_COMMENT;
      36  DIAG_IGNORE_NEEDS_COMMENT (8, "-Wmaybe-uninitialized");
      37  #include <soft-fp.h>
      38  #include <single.h>
      39  #include <quad.h>
      40  
      41  float
      42  __fdivl (_Float128 x, _Float128 y)
      43  {
      44    FP_DECL_EX;
      45    FP_DECL_Q (X);
      46    FP_DECL_Q (Y);
      47    FP_DECL_Q (R);
      48    FP_DECL_S (RN);
      49    float ret;
      50  
      51    FP_INIT_ROUNDMODE;
      52    FP_UNPACK_Q (X, x);
      53    FP_UNPACK_Q (Y, y);
      54    FP_DIV_Q (R, X, Y);
      55  #if _FP_W_TYPE_SIZE < 64
      56    FP_TRUNC_COOKED (S, Q, 1, 4, RN, R);
      57  #else
      58    FP_TRUNC_COOKED (S, Q, 1, 2, RN, R);
      59  #endif
      60    FP_PACK_S (ret, RN);
      61    FP_HANDLE_EXCEPTIONS;
      62    CHECK_NARROW_DIV (ret, x, y);
      63    return ret;
      64  }
      65  DIAG_POP_NEEDS_COMMENT;
      66  
      67  libm_alias_float_ldouble (div)