sysdeps/powerpc/powerpc64/le/fpu/e_sqrtf128.c

   1 /* soft-fp sqrt for _Float128
   2    Return sqrt(a)
   3    Copyright (C) 2017-2022 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)