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/* MIPS3 __mpn_submul_1 -- Multiply a limb vector with a single limb and
* subtract the product from a second limb vector.
*
* Copyright (C) 1992-2024 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 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.
*
* 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the GNU MP Library. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <sysdep.h>
#include <sys/asm.h>
/* INPUT PARAMETERS
* res_ptr $4
* s1_ptr $5
* size $6
* s2_limb $7
*/
#ifdef __PIC__
.option pic2
#endif
ENTRY (__mpn_submul_1)
#ifdef __PIC__
SETUP_GP /* ??? unused */
#endif
.set noreorder
.set nomacro
# warm up phase 0
ld $8,0($5)
# warm up phase 1
daddiu $5,$5,8
#if __mips_isa_rev < 6
dmultu $8,$7
#else
dmulu $11,$8,$7
dmuhu $12,$8,$7
#endif
daddiu $6,$6,-1
beq $6,$0,L(LC0)
move $2,$0 # zero cy2
daddiu $6,$6,-1
beq $6,$0,L(LC1)
ld $8,0($5) # load new s1 limb as early as possible
L(Loop): ld $10,0($4)
#if __mips_isa_rev < 6
mflo $3
mfhi $9
#else
move $3,$11
move $9,$12
#endif
daddiu $5,$5,8
daddu $3,$3,$2 # add old carry limb to low product limb
#if __mips_isa_rev < 6
dmultu $8,$7
#else
dmulu $11,$8,$7
dmuhu $12,$8,$7
#endif
ld $8,0($5) # load new s1 limb as early as possible
daddiu $6,$6,-1 # decrement loop counter
sltu $2,$3,$2 # carry from previous addition -> $2
dsubu $3,$10,$3
sgtu $10,$3,$10
daddu $2,$2,$10
sd $3,0($4)
daddiu $4,$4,8
bne $6,$0,L(Loop)
daddu $2,$9,$2 # add high product limb and carry from addition
# cool down phase 1
L(LC1): ld $10,0($4)
#if __mips_isa_rev < 6
mflo $3
mfhi $9
#else
move $3,$11
move $9,$12
#endif
daddu $3,$3,$2
sltu $2,$3,$2
#if __mips_isa_rev < 6
dmultu $8,$7
#else
dmulu $11,$8,$7
dmuhu $12,$8,$7
#endif
dsubu $3,$10,$3
sgtu $10,$3,$10
daddu $2,$2,$10
sd $3,0($4)
daddiu $4,$4,8
daddu $2,$9,$2 # add high product limb and carry from addition
# cool down phase 0
L(LC0): ld $10,0($4)
#if __mips_isa_rev < 6
mflo $3
mfhi $9
#else
move $3,$11
move $9,$12
#endif
daddu $3,$3,$2
sltu $2,$3,$2
dsubu $3,$10,$3
sgtu $10,$3,$10
daddu $2,$2,$10
sd $3,0($4)
j $31
daddu $2,$9,$2 # add high product limb and carry from addition
END (__mpn_submul_1)
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