1  /* long double square root in software floating-point emulation.
       2     Copyright (C) 1997-2023 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     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdlib.h>
      20  #include <soft-fp.h>
      21  #include <quad.h>
      22  #include <shlib-compat.h>
      23  
      24  long double
      25  __ieee754_sqrtl (const long double a)
      26  {
      27    FP_DECL_EX;
      28    FP_DECL_Q(A); FP_DECL_Q(C);
      29    long double c;
      30    long _round = 4;	/* dynamic rounding */
      31  
      32    FP_INIT_ROUNDMODE;
      33    FP_UNPACK_Q(A, a);
      34    FP_SQRT_Q(C, A);
      35    FP_PACK_Q(c, C);
      36    FP_HANDLE_EXCEPTIONS;
      37    return c;
      38  }
      39  
      40  /* ??? We forgot to add this symbol in 2.15.  Getting this into 2.18 isn't as
      41     straight-forward as just adding the alias, since a generic Versions file
      42     includes the 2.15 version and the linker uses the first one it sees.  */
      43  #if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
      44  compat_symbol (libm, __ieee754_sqrtl, __sqrtl_finite, GLIBC_2_18);
      45  #endif