dnl  MIPS32 mpn_submul_1 -- Multiply a limb vector with a single limb and

dnl  subtract the product from a second limb vector.

dnl  Copyright 1992, 1994, 1996, 2000, 2002 Free Software Foundation, Inc.

dnl  This file is part of the GNU MP Library.

dnl

dnl  The GNU MP Library is free software; you can redistribute it and/or modify

dnl  it under the terms of either:

dnl

dnl    * the GNU Lesser General Public License as published by the Free

dnl      Software Foundation; either version 3 of the License, or (at your

dnl      option) any later version.

dnl

dnl  or

dnl

dnl    * the GNU General Public License as published by the Free Software

dnl      Foundation; either version 2 of the License, or (at your option) any

dnl      later version.

dnl

dnl  or both in parallel, as here.

dnl

dnl  The GNU MP Library is distributed in the hope that it will be useful, but

dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY

dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

dnl  for more details.

dnl

dnl  You should have received copies of the GNU General Public License and the

dnl  GNU Lesser General Public License along with the GNU MP Library.  If not,

dnl  see https://www.gnu.org/licenses/.

include(`../config.m4')

C INPUT PARAMETERS

C res_ptr	$4

C s1_ptr	$5

C size		$6

C s2_limb	$7

ASM_START()

PROLOGUE(mpn_submul_1)

C feed-in phase 0

	lw	$8,0($5)

C feed-in phase 1

	addiu	$5,$5,4

	multu	$8,$7

	addiu	$6,$6,-1

	beq	$6,$0,$LC0

	 move	$2,$0		C zero cy2

	addiu	$6,$6,-1

	beq	$6,$0,$LC1

	lw	$8,0($5)	C load new s1 limb as early as possible

Loop:	lw	$10,0($4)

	mflo	$3

	mfhi	$9

	addiu	$5,$5,4

	addu	$3,$3,$2	C add old carry limb to low product limb

	multu	$8,$7

	lw	$8,0($5)	C load new s1 limb as early as possible

	addiu	$6,$6,-1	C decrement loop counter

	sltu	$2,$3,$2	C carry from previous addition -> $2

	subu	$3,$10,$3

	sgtu	$10,$3,$10

	addu	$2,$2,$10

	sw	$3,0($4)

	addiu	$4,$4,4

	bne	$6,$0,Loop

	 addu	$2,$9,$2	C add high product limb and carry from addition

C wind-down phase 1

$LC1:	lw	$10,0($4)

	mflo	$3

	mfhi	$9

	addu	$3,$3,$2

	sltu	$2,$3,$2

	multu	$8,$7

	subu	$3,$10,$3

	sgtu	$10,$3,$10

	addu	$2,$2,$10

	sw	$3,0($4)

	addiu	$4,$4,4

	addu	$2,$9,$2	C add high product limb and carry from addition

C wind-down phase 0

$LC0:	lw	$10,0($4)

	mflo	$3

	mfhi	$9

	addu	$3,$3,$2

	sltu	$2,$3,$2

	subu	$3,$10,$3

	sgtu	$10,$3,$10

	addu	$2,$2,$10

	sw	$3,0($4)

	j	$31

	addu	$2,$9,$2	C add high product limb and carry from addition

EPILOGUE(mpn_submul_1)