2002-06-29 14:15:02 +00:00
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/* MIPS3 submul_1 -- Multiply a limb vector with a single limb and
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* subtract the product from a second limb vector.
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*
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* Copyright (C) 1992, 1994, 1995, 1998, 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 10:48:09 +00:00
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* the Free Software Foundation; either version 3 of the License, or
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2002-06-29 14:15:02 +00:00
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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 10:48:09 +00:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2002-06-29 14:15:02 +00:00
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*/
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/*******************
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* mpi_limb_t
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* mpihelp_submul_1( mpi_ptr_t res_ptr, (r4)
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* mpi_ptr_t s1_ptr, (r5)
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* mpi_size_t s1_size, (r6)
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* mpi_limb_t s2_limb) (r7)
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*/
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.text
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.align 4
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.globl mpihelp_submul_1
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.ent mpihelp_submul_1
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mpihelp_submul_1:
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.set noreorder
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.set nomacro
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/* # warm up phase 0 */
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ld $8,0($5)
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/* # warm up phase 1 */
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daddiu $5,$5,8
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dmultu $8,$7
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daddiu $6,$6,-1
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beq $6,$0,$LC0
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move $2,$0 # zero cy2
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daddiu $6,$6,-1
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beq $6,$0,$LC1
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ld $8,0($5) # load new s1 limb as early as possible
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Loop: ld $10,0($4)
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mflo $3
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mfhi $9
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daddiu $5,$5,8
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daddu $3,$3,$2 # add old carry limb to low product limb
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dmultu $8,$7
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ld $8,0($5) # load new s1 limb as early as possible
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daddiu $6,$6,-1 # decrement loop counter
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sltu $2,$3,$2 # carry from previous addition -> $2
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dsubu $3,$10,$3
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sgtu $10,$3,$10
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daddu $2,$2,$10
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sd $3,0($4)
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daddiu $4,$4,8
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bne $6,$0,Loop
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daddu $2,$9,$2 # add high product limb and carry from addition
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/* # cool down phase 1 */
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$LC1: ld $10,0($4)
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mflo $3
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mfhi $9
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daddu $3,$3,$2
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sltu $2,$3,$2
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dmultu $8,$7
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dsubu $3,$10,$3
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sgtu $10,$3,$10
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daddu $2,$2,$10
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sd $3,0($4)
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daddiu $4,$4,8
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daddu $2,$9,$2 # add high product limb and carry from addition
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/* # cool down phase 0 */
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$LC0: ld $10,0($4)
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mflo $3
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mfhi $9
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daddu $3,$3,$2
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sltu $2,$3,$2
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dsubu $3,$10,$3
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sgtu $10,$3,$10
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daddu $2,$2,$10
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sd $3,0($4)
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j $31
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daddu $2,$9,$2 # add high product limb and carry from addition
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.end mpihelp_submul_1
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