1  /* Software floating-point emulation.
       2     (*c) = (*a) * (*b)
       3     Copyright (C) 1997-2023 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     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  /* As QP_HANDLE_EXCEPTIONS reloads FPU control word anyway,
      21     avoid doing it twice.  */
      22  #define _FP_MUL_MEAT_RESET_FE do {} while (0)
      23  #include "soft-fp.h"
      24  #include "quad.h"
      25  
      26  void _Qp_mul(long double *c, const long double *a, const long double *b)
      27  {
      28    FP_DECL_EX;
      29    FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
      30  
      31    FP_INIT_ROUNDMODE;
      32    FP_UNPACK_QP(A, a);
      33    FP_UNPACK_QP(B, b);
      34    FP_MUL_Q(C, A, B);
      35    FP_PACK_QP(c, C);
      36    QP_HANDLE_EXCEPTIONS(
      37  	_FPU_SETCW(_fcw);
      38  	__asm (
      39  "	ldd [%1], %%f52\n"
      40  "	ldd [%1+8], %%f54\n"
      41  "	ldd [%2], %%f56\n"
      42  "	ldd [%2+8], %%f58\n"
      43  "	fmulq %%f52, %%f56, %%f60\n"
      44  "	std %%f60, [%0]\n"
      45  "	std %%f62, [%0+8]\n"
      46  "	" : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
      47  }