sysdeps/sparc/sparc64/soft-fp/qp_mul.c

   1 /* Software floating-point emulation.
   2    (*c) = (*a) * (*b)
   3    Copyright (C) 1997,1999 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Richard Henderson (rth@cygnus.com) and
   6                   Jakub Jelinek (jj@ultra.linux.cz).
   7
   8    The GNU C Library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 2.1 of the License, or (at your option) any later version.
  12
  13    The GNU C Library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with the GNU C Library; if not, write to the Free
  20    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21    02111-1307 USA.  */
  22
  23 /* As QP_HANDLE_EXCEPTIONS reloads FPU control word anyway,
  24    avoid doing it twice.  */
  25 #define _FP_MUL_MEAT_RESET_FE do {} while (0)
  26 #include "soft-fp.h"
  27 #include "quad.h"
  28
  29 void _Qp_mul(long double *c, const long double *a, const long double *b)
  30 {
  31   FP_DECL_EX;
  32   FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
  33
  34   FP_INIT_ROUNDMODE;
  35   FP_UNPACK_QP(A, a);
  36   FP_UNPACK_QP(B, b);
  37   FP_MUL_Q(C, A, B);
  38   FP_PACK_QP(c, C);
  39   QP_HANDLE_EXCEPTIONS(
  40         _FPU_SETCW(_fcw);
  41         __asm (
  42 "       ldd [%1], %%f52\n"
  43 "       ldd [%1+8], %%f54\n"
  44 "       ldd [%2], %%f56\n"
  45 "       ldd [%2+8], %%f58\n"
  46 "       fmulq %%f52, %%f56, %%f60\n"
  47 "       std %%f60, [%0]\n"
  48 "       std %%f62, [%0+8]\n"
  49 "       " : : "r" (c), "r" (a), "r" (b) : QP_CLOBBER));
  50 }