uclibc-ng/libc/sysdeps/linux/sparc64/soft-fp/qp_qtod.c

/* Software floating-point emulation.
   Return (double)(*a)
   Copyright (C) 1997-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Richard Henderson (rth@cygnus.com) and
		  Jakub Jelinek (jj@ultra.linux.cz).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include "soft-fp.h"
#include "double.h"
#include "quad.h"

double _Qp_qtod(const long double *a)
{
  FP_DECL_EX;
  FP_DECL_Q(A);
  FP_DECL_D(R);
  double r;

  FP_INIT_ROUNDMODE;
  FP_UNPACK_SEMIRAW_QP(A, a);
#if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
  FP_TRUNC(D,Q,2,4,R,A);
#else
  FP_TRUNC(D,Q,1,2,R,A);
#endif
  FP_PACK_SEMIRAW_D(r, R);
  QP_HANDLE_EXCEPTIONS(__asm (
"	ldd [%1], %%f52\n"
"	ldd [%1+8], %%f54\n"
"	fqtod %%f52, %0\n"
"	" : "=&e" (r) : "r" (a) : QP_CLOBBER));

  return r;
}