| /* PowerPC-32 addmul_1 -- Multiply a limb vector with a limb and add |
| * the result to a second limb vector. |
| * |
| * Copyright (C) 1995, 1998, 2002 Free Software Foundation, Inc. |
| * |
| * This file is part of Libgcrypt. |
| * |
| * Libgcrypt 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. |
| * |
| * Libgcrypt 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 this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| #include "sysdep.h" |
| #include "asm-syntax.h" |
| |
| |
| #ifndef USE_PPC_PATCHES |
| |
| /******************* |
| * mpi_limb_t |
| * _gcry_mpih_addmul_1( mpi_ptr_t res_ptr, (r3) |
| * mpi_ptr_t s1_ptr, (r4) |
| * mpi_size_t s1_size, (r5) |
| * mpi_limb_t s2_limb) (r6) |
| * |
| * This is a fairly straightforward implementation. The timing of the PC601 |
| * is hard to understand, so I will wait to optimize this until I have some |
| * hardware to play with. |
| * |
| * The code trivially generalizes to 64 bit limbs for the PC620. |
| */ |
| |
| |
| .toc |
| .csect ._gcry_mpih_addmul_1[PR] |
| .align 2 |
| .globl _gcry_mpih_addmul_1 |
| .globl ._gcry_mpih_addmul_1 |
| .csect _gcry_mpih_addmul_1[DS] |
| _gcry_mpih_addmul_1: |
| .long ._gcry_mpih_addmul_1[PR], TOC[tc0], 0 |
| .csect ._gcry_mpih_addmul_1[PR] |
| ._gcry_mpih_addmul_1: |
| mtctr 5 |
| |
| lwz 0,0(4) |
| mullw 7,0,6 |
| mulhwu 10,0,6 |
| lwz 9,0(3) |
| addc 8,7,9 |
| addi 3,3,-4 |
| bdz Lend |
| |
| Loop: lwzu 0,4(4) |
| stwu 8,4(3) |
| mullw 8,0,6 |
| adde 7,8,10 |
| mulhwu 10,0,6 |
| lwz 9,4(3) |
| addze 10,10 |
| addc 8,7,9 |
| bdnz Loop |
| |
| Lend: stw 8,4(3) |
| addze 3,10 |
| blr |
| |
| #else |
| /* Multiply a limb vector by a single limb, for PowerPC. |
| Copyright (C) 1993, 1994, 1995, 1997 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 Library General Public License as |
| published by the Free Software Foundation; either version 2 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 |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| |
| /* mp_limb_t mpn_addmul_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(_gcry_mpih_addmul_1) |
| mtctr %r5 |
| |
| lwz %r0,0(%r4) |
| mullw %r7,%r0,%r6 |
| mulhwu %r10,%r0,%r6 |
| lwz %r9,0(%r3) |
| addc %r8,%r7,%r9 |
| addi %r3,%r3,-4 /* adjust res_ptr */ |
| bdz 1f |
| |
| 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 |
| addc %r8,%r7,%r9 |
| bdnz 0b |
| |
| 1: stw %r8,4(%r3) |
| addze %r3,%r10 |
| blr |
| END(_gcry_mpih_addmul_1) |
| #endif |