dnl  SPARC v9 mpn_addlsh_n and mpn_sublsh_n for T3/T4/T5.

dnl  Contributed to the GNU project by Torbjörn Granlund.

dnl  Copyright 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 UltraSPARC T3:	11

C UltraSPARC T4:	 4

C For sublsh_n we combine the two shifted limbs using xnor, using the identity

C (a xor not b) = (not (a xor b)) which equals (not (a or b)) when (a and b) =

C 0 as it is in our usage.  This gives us the ones complement for free.

C Unfortunately, the same trick will not work for rsblsh_n, which will instead

C require a separate negation.

C

C FIXME: Add rsblsh_n to this file.

define(`rp', `%i0')

define(`up', `%i1')

define(`vp', `%i2')

define(`n',  `%i3')

define(`cnt',`%i4')

define(`tnc',`%o5')

ifdef(`OPERATION_addlsh_n',`

  define(`INITCY', `subcc	%g0, 0, %g0')

  define(`MERGE',  `or')

  define(`func',   `mpn_addlsh_n')

')

ifdef(`OPERATION_sublsh_n',`

  define(`INITCY', `subcc	%g0, 1, %g0')

  define(`MERGE',  `xnor')

  define(`func',   `mpn_sublsh_n')

')

define(`rp0',  `rp')

define(`rp1',  `%o2')

define(`up0',  `up')

define(`up1',  `%o3')

define(`vp0',  `vp')

define(`vp1',  `%o4')

MULFUNC_PROLOGUE(mpn_addlsh_n mpn_sublsh_n)

ASM_START()

	REGISTER(%g2,#scratch)

	REGISTER(%g3,#scratch)

PROLOGUE(func)

	save	%sp, -176, %sp

	mov	64, tnc

	sub	tnc, cnt, tnc

	andcc	n, 1, %g0

	sllx	n, 3, n

	add	n, -16, n

	add	up, n, up0

	add	vp, n, vp0

	add	rp, n, rp0

	add	up0, 8, up1

	add	vp0, 8, vp1

	add	rp0, -8, rp1

	add	rp0, -16, rp0

	neg	n, n

	be	L(evn)

	 INITCY

L(odd):	ldx	[vp0 + n], %l1

	mov	0, %l2

	ldx	[up0 + n], %l5

	sllx	%l1, cnt, %g3

	brgez	n, L(wd1)

	 add	n, 8, n

	ldx	[vp0 + n], %l0

	b	L(lo1)

	 sllx	%l1, cnt, %g3

L(evn):	ldx	[vp0 + n], %l0

	mov	0, %l3

	ldx	[up0 + n], %l4

	ldx	[vp1 + n], %l1

	b	L(lo0)

	 sllx	%l0, cnt, %g1

L(top):	addxccc(%l6, %l4, %o0)

	ldx	[vp0 + n], %l0

	sllx	%l1, cnt, %g3

	stx	%o0, [rp0 + n]

L(lo1):	srlx	%l1, tnc, %l3

	MERGE	%l2, %g3, %l7

	ldx	[up0 + n], %l4

	addxccc(%l7, %l5, %o1)

	ldx	[vp1 + n], %l1

	sllx	%l0, cnt, %g1

	stx	%o1, [rp1 + n]

L(lo0):	srlx	%l0, tnc, %l2

	MERGE	%l3, %g1, %l6

	ldx	[up1 + n], %l5

	brlz,pt	n, L(top)

	 add	n, 16, n

	addxccc(%l6, %l4, %o0)

	sllx	%l1, cnt, %g3

	stx	%o0, [rp0 + n]

L(wd1):	srlx	%l1, tnc, %l3

	MERGE	%l2, %g3, %l7

	addxccc(%l7, %l5, %o1)

	stx	%o1, [rp1 + n]

ifdef(`OPERATION_addlsh_n',

`	addxc(	%l3, %g0, %i0)')

ifdef(`OPERATION_sublsh_n',

`	addxc(	%g0, %g0, %g1)

	add	%g1, -1, %g1

	sub	%l3, %g1, %i0')

	ret

	 restore

EPILOGUE()