dnl  Alpha mpn_addlsh1_n/mpn_sublsh1_n -- rp[] = up[] +- (vp[] << 1).

dnl  Copyright 2003, 2013 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      cycles/limb

C EV4:     ?

C EV5:     6.25

C EV6:     4.5

define(`rp',`r16')

define(`up',`r17')

define(`vp',`r18')

define(`n', `r19')

define(`u0', `r8')

define(`u1', `r1')

define(`v0', `r4')

define(`v1', `r5')

define(`cy0', `r0')

define(`cy1', `r20')

define(`cy', `r22')

define(`rr', `r24')

define(`ps', `r25')

define(`sl', `r28')

ifdef(`OPERATION_addlsh1_n',`

  define(ADDSUB,       addq)

  define(CARRY,       `cmpult $1,$2,$3')

  define(func, mpn_addlsh1_n)

')

ifdef(`OPERATION_sublsh1_n',`

  define(ADDSUB,       subq)

  define(CARRY,       `cmpult $2,$1,$3')

  define(func, mpn_sublsh1_n)

')

MULFUNC_PROLOGUE(mpn_addlsh1_n mpn_sublsh1_n)

ASM_START()

PROLOGUE(func)

	and	n, 2, cy0

	blbs	n, L(bx1)

L(bx0):	ldq	v1, 0(vp)

	ldq	u1, 0(up)

	nop

	bne	cy0, L(b10)

L(b00):	lda	vp, 48(vp)

	lda	up, -16(up)

	lda	rp, -8(rp)

	br	r31, L(lo0)

L(b10):	lda	vp, 32(vp)

	lda	rp, 8(rp)

	lda	cy0, 0(r31)

	br	r31, L(lo2)

L(bx1):	ldq	v0, 0(vp)

	ldq	u0, 0(up)

	lda	cy1, 0(r31)

	beq	cy0, L(b01)

L(b11):	lda	vp, 40(vp)

	lda	up, -24(up)

	lda	rp, 16(rp)

	br	r31, L(lo3)

L(b01):	lda	n, -4(n)

	ble	n, L(end)

	lda	vp, 24(vp)

	lda	up, -8(up)

	ALIGN(16)

L(top):	addq	v0, v0, sl	C left shift vlimb

	ldq	v1, -16(vp)

	ADDSUB	u0, sl, ps	C ulimb + (vlimb << 1)

	cmplt	v0, r31, cy0	C carry out #1

	ldq	u1, 16(up)

	ADDSUB	ps, cy1, rr	C consume carry from previous operation

	CARRY(	ps, u0, cy)	C carry out #2

	stq	rr, 0(rp)

	addq	cy, cy0, cy0	C combine carry out #1 and #2

	CARRY(	rr, ps, cy)	C carry out #3

	addq	cy, cy0, cy0	C final carry out

	lda	vp, 32(vp)	C bookkeeping

L(lo0):	addq	v1, v1, sl

	ldq	v0, -40(vp)

	ADDSUB	u1, sl, ps

	cmplt	v1, r31, cy1

	ldq	u0, 24(up)

	ADDSUB	ps, cy0, rr

	CARRY(	ps, u1, cy)

	stq	rr, 8(rp)

	addq	cy, cy1, cy1

	CARRY(	rr, ps, cy)

	addq	cy, cy1, cy1

	lda	rp, 32(rp)	C bookkeeping

L(lo3):	addq	v0, v0, sl

	ldq	v1, -32(vp)

	ADDSUB	u0, sl, ps

	cmplt	v0, r31, cy0

	ldq	u1, 32(up)

	ADDSUB	ps, cy1, rr

	CARRY(	ps, u0, cy)

	stq	rr, -16(rp)

	addq	cy, cy0, cy0

	CARRY(	rr, ps, cy)

	addq	cy, cy0, cy0

	lda	up, 32(up)	C bookkeeping

L(lo2):	addq	v1, v1, sl

	ldq	v0, -24(vp)

	ADDSUB	u1, sl, ps

	cmplt	v1, r31, cy1

	ldq	u0, 8(up)

	ADDSUB	ps, cy0, rr

	CARRY(	ps, u1, cy)

	stq	rr, -8(rp)

	addq	cy, cy1, cy1

	CARRY(	rr, ps, cy)

	addq	cy, cy1, cy1

	lda	n, -4(n)	C bookkeeping

	bgt	n, L(top)

L(end):	addq	v0, v0, sl

	ADDSUB	u0, sl, ps

	ADDSUB	ps, cy1, rr

	cmplt	v0, r31, cy0

	CARRY(	ps, u0, cy)

	stq	rr, 0(rp)

	addq	cy, cy0, cy0

	CARRY(	rr, ps, cy)

	addq	cy, cy0, r0

	ret	r31,(r26),1

EPILOGUE()

ASM_END()