mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
95 lines
2.6 KiB
ArmAsm
95 lines
2.6 KiB
ArmAsm
/* Alpha 21064 submul_1 -- Multiply a limb vector with a limb and
|
|
* subtract the result from a second limb vector.
|
|
* Copyright (C) 1992, 1994, 1995, 1998,
|
|
* 2001 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/>.
|
|
*/
|
|
|
|
|
|
/*******************
|
|
* mpi_limb_t
|
|
* mpihelp_submul_1( mpi_ptr_t res_ptr, (r16 )
|
|
* mpi_ptr_t s1_ptr, (r17 )
|
|
* mpi_size_t s1_size, (r18 )
|
|
* mpi_limb_t s2_limb) (r19 )
|
|
*
|
|
* This code runs at 42 cycles/limb on EV4 and 18 cycles/limb on EV5.
|
|
*/
|
|
|
|
.set noreorder
|
|
.set noat
|
|
.text
|
|
.align 3
|
|
.globl mpihelp_submul_1
|
|
.ent mpihelp_submul_1 2
|
|
mpihelp_submul_1:
|
|
.frame $30,0,$26
|
|
|
|
ldq $2,0($17) # $2 = s1_limb
|
|
addq $17,8,$17 # s1_ptr++
|
|
subq $18,1,$18 # size--
|
|
mulq $2,$19,$3 # $3 = prod_low
|
|
ldq $5,0($16) # $5 = *res_ptr
|
|
umulh $2,$19,$0 # $0 = prod_high
|
|
beq $18,.Lend1 # jump if size was == 1
|
|
ldq $2,0($17) # $2 = s1_limb
|
|
addq $17,8,$17 # s1_ptr++
|
|
subq $18,1,$18 # size--
|
|
subq $5,$3,$3
|
|
cmpult $5,$3,$4
|
|
stq $3,0($16)
|
|
addq $16,8,$16 # res_ptr++
|
|
beq $18,.Lend2 # jump if size was == 2
|
|
|
|
.align 3
|
|
.Loop: mulq $2,$19,$3 # $3 = prod_low
|
|
ldq $5,0($16) # $5 = *res_ptr
|
|
addq $4,$0,$0 # cy_limb = cy_limb + 'cy'
|
|
subq $18,1,$18 # size--
|
|
umulh $2,$19,$4 # $4 = cy_limb
|
|
ldq $2,0($17) # $2 = s1_limb
|
|
addq $17,8,$17 # s1_ptr++
|
|
addq $3,$0,$3 # $3 = cy_limb + prod_low
|
|
cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low)
|
|
subq $5,$3,$3
|
|
cmpult $5,$3,$5
|
|
stq $3,0($16)
|
|
addq $16,8,$16 # res_ptr++
|
|
addq $5,$0,$0 # combine carries
|
|
bne $18,.Loop
|
|
|
|
.Lend2: mulq $2,$19,$3 # $3 = prod_low
|
|
ldq $5,0($16) # $5 = *res_ptr
|
|
addq $4,$0,$0 # cy_limb = cy_limb + 'cy'
|
|
umulh $2,$19,$4 # $4 = cy_limb
|
|
addq $3,$0,$3 # $3 = cy_limb + prod_low
|
|
cmpult $3,$0,$0 # $0 = carry from (cy_limb + prod_low)
|
|
subq $5,$3,$3
|
|
cmpult $5,$3,$5
|
|
stq $3,0($16)
|
|
addq $5,$0,$0 # combine carries
|
|
addq $4,$0,$0 # cy_limb = prod_high + cy
|
|
ret $31,($26),1
|
|
.Lend1: subq $5,$3,$3
|
|
cmpult $5,$3,$5
|
|
stq $3,0($16)
|
|
addq $0,$5,$0
|
|
ret $31,($26),1
|
|
|
|
.end mpihelp_submul_1
|
|
|