mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-23 10:29:58 +01:00
101 lines
2.5 KiB
ArmAsm
101 lines
2.5 KiB
ArmAsm
/* PowerPC-32 mul_1 -- Multiply a limb vector with a limb and store
|
|
* the result in a second limb vector.
|
|
*
|
|
* Copyright (C) 1992, 1993, 1994, 1995, 1997
|
|
* 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 3 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "sysdep.h"
|
|
#include "asm-syntax.h"
|
|
|
|
|
|
#ifndef USE_PPC_PATCHES
|
|
|
|
/*******************
|
|
* 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
|
|
|
|
#else
|
|
|
|
/* mp_limb_t mpn_mul_1 (mp_ptr res_ptr, mp_srcptr s1_ptr,
|
|
mp_size_t s1_size, mp_limb_t s2_limb)
|
|
Calculate s1*s2 and put result in res_ptr; return carry. */
|
|
|
|
ENTRY(mpihelp_mul_1)
|
|
mtctr %r5
|
|
|
|
lwz %r0,0(%r4)
|
|
mullw %r7,%r0,%r6
|
|
mulhwu %r10,%r0,%r6
|
|
addi %r3,%r3,-4 # adjust res_ptr
|
|
addic %r5,%r5,0 # clear cy with dummy insn
|
|
bdz 1f
|
|
|
|
0: lwzu %r0,4(%r4)
|
|
stwu %r7,4(%r3)
|
|
mullw %r8,%r0,%r6
|
|
adde %r7,%r8,%r10
|
|
mulhwu %r10,%r0,%r6
|
|
bdnz 0b
|
|
|
|
1: stw %r7,4(%r3)
|
|
addze %r3,%r10
|
|
blr
|
|
END(mpihelp_mul_1)
|
|
#endif
|