2002-06-29 16:15:02 +02:00
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/* mips3 sub_n -- Subtract two limb vectors of the same length > 0 and
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* store difference in a third limb vector.
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*
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* Copyright (C) 1995, 1998, 1999, 2000,
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* 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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2007-10-23 12:48:09 +02:00
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* the Free Software Foundation; either version 3 of the License, or
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2002-06-29 16:15:02 +02:00
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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2007-10-23 12:48:09 +02:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2002-06-29 16:15:02 +02:00
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*/
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/*******************
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* mpi_limb_t
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* mpihelp_sub_n( mpi_ptr_t res_ptr, (r4)
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* mpi_ptr_t s1_ptr, (r5)
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* mpi_ptr_t s2_ptr, (r6)
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* mpi_size_t size) (r7)
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*/
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.text
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.align 2
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.globl mpihelp_sub_n
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.ent mpihelp_sub_n
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mpihelp_sub_n:
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.set noreorder
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.set nomacro
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ld $10,0($5)
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ld $11,0($6)
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daddiu $7,$7,-1
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and $9,$7,4-1 # number of limbs in first loop
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beq $9,$0,.L0 # if multiple of 4 limbs, skip first loop
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move $2,$0
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dsubu $7,$7,$9
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.Loop0: daddiu $9,$9,-1
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ld $12,8($5)
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daddu $11,$11,$2
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ld $13,8($6)
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sltu $8,$11,$2
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dsubu $11,$10,$11
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sltu $2,$10,$11
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sd $11,0($4)
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or $2,$2,$8
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daddiu $5,$5,8
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daddiu $6,$6,8
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move $10,$12
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move $11,$13
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bne $9,$0,.Loop0
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daddiu $4,$4,8
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.L0: beq $7,$0,.Lend
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nop
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.Loop: daddiu $7,$7,-4
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ld $12,8($5)
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daddu $11,$11,$2
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ld $13,8($6)
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sltu $8,$11,$2
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dsubu $11,$10,$11
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sltu $2,$10,$11
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sd $11,0($4)
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or $2,$2,$8
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ld $10,16($5)
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daddu $13,$13,$2
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ld $11,16($6)
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sltu $8,$13,$2
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dsubu $13,$12,$13
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sltu $2,$12,$13
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sd $13,8($4)
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or $2,$2,$8
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ld $12,24($5)
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daddu $11,$11,$2
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ld $13,24($6)
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sltu $8,$11,$2
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dsubu $11,$10,$11
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sltu $2,$10,$11
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sd $11,16($4)
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or $2,$2,$8
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ld $10,32($5)
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daddu $13,$13,$2
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ld $11,32($6)
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sltu $8,$13,$2
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dsubu $13,$12,$13
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sltu $2,$12,$13
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sd $13,24($4)
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or $2,$2,$8
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daddiu $5,$5,32
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daddiu $6,$6,32
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bne $7,$0,.Loop
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daddiu $4,$4,32
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.Lend: daddu $11,$11,$2
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sltu $8,$11,$2
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dsubu $11,$10,$11
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sltu $2,$10,$11
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sd $11,0($4)
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j $31
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or $2,$2,$8
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.end mpihelp_sub_n
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