dnl  IBM POWER mpn_add_n -- Add two limb vectors of equal, non-zero length.

dnl  Copyright 1992, 1994-1996, 1999-2001, 2005 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/.

dnl  INPUT PARAMETERS

dnl  res_ptr	r3

dnl  s1_ptr	r4

dnl  s2_ptr	r5

dnl  size	r6

include(`../config.m4')

ASM_START()

PROLOGUE(mpn_add_n)

	andil.	10,6,1		C odd or even number of limbs?

	l	8,0(4)		C load least significant s1 limb

	l	0,0(5)		C load least significant s2 limb

	cal	3,-4(3)		C offset res_ptr, it's updated before it's used

	sri	10,6,1		C count for unrolled loop

	a	7,0,8		C add least significant limbs, set cy

	mtctr	10		C copy count into CTR

	beq	0,Leven		C branch if even # of limbs (# of limbs >= 2)

C We have an odd # of limbs.  Add the first limbs separately.

	cmpi	1,10,0		C is count for unrolled loop zero?

	bc	4,6,L1		C bne cr1,L1 (misassembled by gas)

	st	7,4(3)

	aze	3,10		C use the fact that r10 is zero...

	br			C return

C We added least significant limbs.  Now reload the next limbs to enter loop.

L1:	lu	8,4(4)		C load s1 limb and update s1_ptr

	lu	0,4(5)		C load s2 limb and update s2_ptr

	stu	7,4(3)

	ae	7,0,8		C add limbs, set cy

Leven:	lu	9,4(4)		C load s1 limb and update s1_ptr

	lu	10,4(5)		C load s2 limb and update s2_ptr

	bdz	Lend		C If done, skip loop

Loop:	lu	8,4(4)		C load s1 limb and update s1_ptr

	lu	0,4(5)		C load s2 limb and update s2_ptr

	ae	11,10,9		C add previous limbs with cy, set cy

	stu	7,4(3)		C

	lu	9,4(4)		C load s1 limb and update s1_ptr

	lu	10,4(5)		C load s2 limb and update s2_ptr

	ae	7,0,8		C add previous limbs with cy, set cy

	stu	11,4(3)		C

	bdn	Loop		C decrement CTR and loop back

Lend:	ae	11,10,9		C add limbs with cy, set cy

	st	7,4(3)		C

	st	11,8(3)		C

	lil	3,0		C load cy into ...

	aze	3,3		C ... return value register

	br

EPILOGUE(mpn_add_n)