sysdeps/powerpc/powerpc32/addmul_1.S

   1 /* Multiply a limb vector by a single limb, for PowerPC.
   2    Copyright (C) 1993-1995, 1997, 1999, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <bp-sym.h>
  21 #include <bp-asm.h>
  22
  23 /* mp_limb_t mpn_addmul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,
  24                            mp_size_t s1_size, mp_limb_t s2_limb)
  25    Calculate res+s1*s2 and put result back in res; return carry.  */
  26 ENTRY (BP_SYM (__mpn_addmul_1))
  27 #if __BOUNDED_POINTERS__
  28         slwi r10,r5,2           /* convert limbs to bytes */
  29         CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10)
  30         CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10)
  31 #endif
  32         mtctr   r5
  33
  34         lwz     r0,0(r4)
  35         mullw   r7,r0,r6
  36         mulhwu  r10,r0,r6
  37         lwz     r9,0(r3)
  38         addc    r8,r7,r9
  39         addi    r3,r3,-4                /* adjust res_ptr */
  40         bdz     L(1)
  41
  42 L(0):   lwzu    r0,4(r4)
  43         stwu    r8,4(r3)
  44         mullw   r8,r0,r6
  45         adde    r7,r8,r10
  46         mulhwu  r10,r0,r6
  47         lwz     r9,4(r3)
  48         addze   r10,r10
  49         addc    r8,r7,r9
  50         bdnz    L(0)
  51
  52 L(1):   stw     r8,4(r3)
  53         addze   r3,r10
  54         blr
  55 END (BP_SYM (__mpn_addmul_1))