/* mips3 sub_n -- Subtract two limb vectors of the same length > 0 and
* store difference in a third limb vector.
*
* Copyright (C) 1995, 1998, 1999, 2000,
* 2001, 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
*/
/*******************
* mpi_limb_t
* _gcry_mpih_sub_n( mpi_ptr_t res_ptr, (r4)
* mpi_ptr_t s1_ptr, (r5)
* mpi_ptr_t s2_ptr, (r6)
* mpi_size_t size) (r7)
*/
.text
.align 2
.globl _gcry_mpih_sub_n
.ent _gcry_mpih_sub_n
_gcry_mpih_sub_n:
.set noreorder
.set nomacro
ld $10,0($5)
ld $11,0($6)
daddiu $7,$7,-1
and $9,$7,4-1 # number of limbs in first loop
beq $9,$0,.L0 # if multiple of 4 limbs, skip first loop
move $2,$0
dsubu $7,$7,$9
.Loop0: daddiu $9,$9,-1
ld $12,8($5)
daddu $11,$11,$2
ld $13,8($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
or $2,$2,$8
daddiu $5,$5,8
daddiu $6,$6,8
move $10,$12
move $11,$13
bne $9,$0,.Loop0
daddiu $4,$4,8
.L0: beq $7,$0,.Lend
nop
.Loop: daddiu $7,$7,-4
ld $12,8($5)
daddu $11,$11,$2
ld $13,8($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
or $2,$2,$8
ld $10,16($5)
daddu $13,$13,$2
ld $11,16($6)
sltu $8,$13,$2
dsubu $13,$12,$13
sltu $2,$12,$13
sd $13,8($4)
or $2,$2,$8
ld $12,24($5)
daddu $11,$11,$2
ld $13,24($6)
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,16($4)
or $2,$2,$8
ld $10,32($5)
daddu $13,$13,$2
ld $11,32($6)
sltu $8,$13,$2
dsubu $13,$12,$13
sltu $2,$12,$13
sd $13,24($4)
or $2,$2,$8
daddiu $5,$5,32
daddiu $6,$6,32
bne $7,$0,.Loop
daddiu $4,$4,32
.Lend: daddu $11,$11,$2
sltu $8,$11,$2
dsubu $11,$10,$11
sltu $2,$10,$11
sd $11,0($4)
j $31
or $2,$2,$8
.end _gcry_mpih_sub_n
