dnl  x86 mpn_sec_tabselect.

dnl  Copyright 2011 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 P5				 ?

C P6 model 0-8,10-12		 ?

C P6 model 9  (Banias)		 ?

C P6 model 13 (Dothan)		 ?

C P4 model 0  (Willamette)	 ?

C P4 model 1  (?)		 ?

C P4 model 2  (Northwood)	 4.5

C P4 model 3  (Prescott)	 ?

C P4 model 4  (Nocona)		 ?

C Intel Atom			 ?

C AMD K6			 ?

C AMD K7			 3.4

C AMD K8			 ?

C AMD K10			 ?

C NOTES

C  * This has not been tuned for any specific processor.  Its speed should not

C    be too bad, though.

C  * Using SSE2 could result in many-fold speedup.

C mpn_sec_tabselect (mp_limb_t *rp, mp_limb_t *tp, mp_size_t n, mp_size_t nents, mp_size_t which)

define(`rp',     `%edi')

define(`tp',     `%esi')

define(`n',      `%ebx')

define(`nents',  `%ecx')

define(`which',  `36(%esp)')

define(`i',      `%ebp')

define(`maskp',  `20(%esp)')

define(`maskn',  `32(%esp)')

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(mpn_sec_tabselect)

	push	%edi

	push	%esi

	push	%ebx

	push	%ebp

	mov	20(%esp), rp

	mov	24(%esp), tp

	mov	28(%esp), n

	mov	32(%esp), nents

	lea	(rp,n,4), rp

	lea	(tp,n,4), tp

	sub	nents, which

L(outer):

	mov	which, %eax

	add	nents, %eax

	neg	%eax			C set CF iff 'which' != k

	sbb	%eax, %eax

	mov	%eax, maskn

	not	%eax

	mov	%eax, maskp

	mov	n, i

	neg	i

	ALIGN(16)

L(top):	mov	(tp,i,4), %eax

	and	maskp, %eax

	mov	(rp,i,4), %edx

	and	maskn, %edx

	or	%edx, %eax

	mov	%eax, (rp,i,4)

	inc	i

	js	L(top)

L(end):	mov	n, %eax

	lea	(tp,%eax,4), tp

	dec	nents

	jne	L(outer)

L(outer_end):

	pop	%ebp

	pop	%ebx

	pop	%esi

	pop	%edi

	ret

EPILOGUE()