1  /* soft-fp sqrt for _Float128
       2     Return sqrt(a)
       3     Copyright (C) 2017-2023 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     In addition to the permissions in the GNU Lesser General Public
      12     License, the Free Software Foundation gives you unlimited
      13     permission to link the compiled version of this file into
      14     combinations with other programs, and to distribute those
      15     combinations without any restriction coming from the use of this
      16     file.  (The Lesser General Public License restrictions do apply in
      17     other respects; for example, they cover modification of the file,
      18     and distribution when not linked into a combine executable.)
      19  
      20     The GNU C Library is distributed in the hope that it will be useful,
      21     but WITHOUT ANY WARRANTY; without even the implied warranty of
      22     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23     Lesser General Public License for more details.
      24  
      25     You should have received a copy of the GNU Lesser General Public
      26     License along with the GNU C Library; if not, see
      27     <https://www.gnu.org/licenses/>.  */
      28  
      29  #include <float128_private.h>
      30  #include <math.h>
      31  #include <libm-alias-finite.h>
      32  
      33  /* Unavoidable hacks since TFmode is assumed to be binary128 when
      34     -mabi=ibmlongdouble is used.  */
      35  #if __HAVE_FLOAT128_UNLIKE_LDBL
      36  # define TFtype KFtype
      37  # define TF KF
      38  #endif
      39  
      40  #include <soft-fp.h>
      41  #include <quad.h>
      42  
      43  __float128
      44  __ieee754_sqrtf128 (__float128 a)
      45  {
      46    __float128 r;
      47    /* For multiarch builds, this will be built twice. */
      48  #ifndef _ARCH_PWR9
      49    FP_DECL_EX;
      50    FP_DECL_Q (A);
      51    FP_DECL_Q (R);
      52  
      53    FP_INIT_ROUNDMODE;
      54    FP_UNPACK_Q (A, a);
      55    FP_SQRT_Q (R, A);
      56    FP_PACK_Q (r, R);
      57    FP_HANDLE_EXCEPTIONS;
      58  #else
      59    asm ("xssqrtqp %0,%1" : "=v" (r) : "v" (a));
      60  #endif
      61    return r;
      62  }
      63  libm_alias_finite (__ieee754_sqrtf128, __sqrtf128)