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/* MIPS2 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
store difference in a third limb vector.
Copyright (C) 1995, 2000 Free Software Foundation, Inc.
This file is part of the GNU MP Library.
The GNU MP 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 MP 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 MP 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. */
#include <sysdep.h>
/* INPUT PARAMETERS
res_ptr $4
s1_ptr $5
s2_ptr $6
size $7
*/
#ifdef __PIC__
.option pic2
#endif
ENTRY (__mpn_sub_n)
.set noreorder
#ifdef __PIC__
.cpload t9
#endif
.set nomacro
lw $10,0($5)
lw $11,0($6)
addiu $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
subu $7,$7,$9
.Loop0: addiu $9,$9,-1
lw $12,4($5)
addu $11,$11,$2
lw $13,4($6)
sltu $8,$11,$2
subu $11,$10,$11
sltu $2,$10,$11
sw $11,0($4)
or $2,$2,$8
addiu $5,$5,4
addiu $6,$6,4
move $10,$12
move $11,$13
bne $9,$0,.Loop0
addiu $4,$4,4
.L0: beq $7,$0,.Lend
nop
.Loop: addiu $7,$7,-4
lw $12,4($5)
addu $11,$11,$2
lw $13,4($6)
sltu $8,$11,$2
subu $11,$10,$11
sltu $2,$10,$11
sw $11,0($4)
or $2,$2,$8
lw $10,8($5)
addu $13,$13,$2
lw $11,8($6)
sltu $8,$13,$2
subu $13,$12,$13
sltu $2,$12,$13
sw $13,4($4)
or $2,$2,$8
lw $12,12($5)
addu $11,$11,$2
lw $13,12($6)
sltu $8,$11,$2
subu $11,$10,$11
sltu $2,$10,$11
sw $11,8($4)
or $2,$2,$8
lw $10,16($5)
addu $13,$13,$2
lw $11,16($6)
sltu $8,$13,$2
subu $13,$12,$13
sltu $2,$12,$13
sw $13,12($4)
or $2,$2,$8
addiu $5,$5,16
addiu $6,$6,16
bne $7,$0,.Loop
addiu $4,$4,16
.Lend: addu $11,$11,$2
sltu $8,$11,$2
subu $11,$10,$11
sltu $2,$10,$11
sw $11,0($4)
j $31
or $2,$2,$8
END (__mpn_sub_n)
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