sysdeps/alpha/e_sqrtl.c

   1 /* long double square root in software floating-point emulation.
   2    Copyright (C) 1997-2022 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