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103 lines
2.3 KiB
ArmAsm
103 lines
2.3 KiB
ArmAsm
/* MIPS3 __mpn_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) 1992-2013 Free Software Foundation, Inc.
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*
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* This file is part of the GNU MP Library.
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*
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* The GNU MP Library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The GNU MP Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the GNU MP Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <sysdep.h>
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#include <sys/asm.h>
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/* INPUT PARAMETERS
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* res_ptr $4
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* s1_ptr $5
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* size $6
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* s2_limb $7
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*/
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#ifdef __PIC__
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.option pic2
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#endif
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ENTRY (__mpn_submul_1)
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#ifdef __PIC__
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SETUP_GP /* ??? unused */
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#endif
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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,L(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,L(LC1)
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ld $8,0($5) # load new s1 limb as early as possible
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L(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,L(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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L(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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L(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 (__mpn_submul_1)
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