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

/* Software floating-point emulation.
   (*c) = (*a) * (*b)
   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/>.  */

/* As QP_HANDLE_EXCEPTIONS reloads FPU control word anyway,
   avoid doing it twice.  */
#define _FP_MUL_MEAT_RESET_FE do {} while (0)
#include "soft-fp.h"
#include "quad.h"

void _Qp_mul(long double *c, const long double *a, const long double *b)
{
  FP_DECL_EX;
  FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);

  FP_INIT_ROUNDMODE;
  FP_UNPACK_QP(A, a);
  FP_UNPACK_QP(B, b);
  FP_MUL_Q(C, A, B);
  FP_PACK_QP(c, C);
  QP_HANDLE_EXCEPTIONS(
	_FPU_SETCW(_fcw);
	__asm (
"	ldd [%1], %%f52\n"
"	ldd [%1+8], %%f54\n"
"	ldd [%2], %%f56\n"
"	ldd [%2+8], %%f58\n"
"	fmulq %%f52, %%f56, %%f60\n"
"	std %%f60, [%0]\n"
"	std %%f62, [%0+8]\n"
"	" : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
}