sysdeps/sparc/sparc64/qp_mul.c

   1 /* Software floating-point emulation.
   2    (*c) = (*a) * (*b)
   3    Copyright (C) 1997-2021 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 }