1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/* PowerPC-32 mul_1 -- Multiply a limb vector with a limb and store
* the result in a second limb vector.
*
* Copyright (C) 1993, 1994, 1995, 1998 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU 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
*/
/*******************
* mpi_limb_t
* mpihelp_mul_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 .mpihelp_mul_1[PR]
.align 2
.globl mpihelp_mul_1
.globl .mpihelp_mul_1
.csect mpihelp_mul_1[DS]
mpihelp_mul_1:
.long .mpihelp_mul_1[PR], TOC[tc0], 0
.csect .mpihelp_mul_1[PR]
.mpihelp_mul_1:
mtctr 5
lwz 0,0(4)
mullw 7,0,6
mulhwu 10,0,6
addi 3,3,-4 # adjust res_ptr
addic 5,5,0 # clear cy with dummy insn
bdz Lend
Loop: lwzu 0,4(4)
stwu 7,4(3)
mullw 8,0,6
adde 7,8,10
mulhwu 10,0,6
bdnz Loop
Lend: stw 7,4(3)
addze 3,10
blr
|