| /* Multiply a limb vector by a single limb, for PowerPC. |
| Copyright (C) 1993-1995, 1997, 1999, 2000 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <sysdep.h> |
| #include <bp-sym.h> |
| #include <bp-asm.h> |
| |
| /* mp_limb_t mpn_submul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr, |
| mp_size_t s1_size, mp_limb_t s2_limb) |
| Calculate res-s1*s2 and put result back in res; return carry. */ |
| |
| ENTRY (BP_SYM (__mpn_submul_1)) |
| #if __BOUNDED_POINTERS__ |
| slwi r10,r5,2 /* convert limbs to bytes */ |
| CHECK_BOUNDS_BOTH_WIDE (r3, r8, r9, r10) |
| CHECK_BOUNDS_BOTH_WIDE (r4, r8, r9, r10) |
| #endif |
| mtctr r5 |
| |
| lwz r0,0(r4) |
| mullw r7,r0,r6 |
| mulhwu r10,r0,r6 |
| lwz r9,0(r3) |
| subf r8,r7,r9 |
| addc r7,r7,r8 # invert cy (r7 is junk) |
| addi r3,r3,-4 # adjust res_ptr |
| bdz L(1) |
| |
| L(0): lwzu r0,4(r4) |
| stwu r8,4(r3) |
| mullw r8,r0,r6 |
| adde r7,r8,r10 |
| mulhwu r10,r0,r6 |
| lwz r9,4(r3) |
| addze r10,r10 |
| subf r8,r7,r9 |
| addc r7,r7,r8 # invert cy (r7 is junk) |
| bdnz L(0) |
| |
| L(1): stw r8,4(r3) |
| addze r3,r10 |
| blr |
| END (BP_SYM (__mpn_submul_1)) |
