dnl  AMD64 mpn_sec_tabselect.

dnl  Contributed to the GNU project by Torbjörn Granlund.

dnl  Copyright 2011-2013 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          good for cpu

C AMD K8,K9	 1.5			Y

C AMD K10	 1.4

C AMD bd1	 2.64

C AMD bobcat	 2.15			Y

C Intel P4	 4

C Intel core2	 1.38

C Intel NHM	 1.75

C Intel SBR	 1.25

C Intel atom	 2.5			Y

C VIA nano	 1.75			Y

C NOTES

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

C    be too bad, though.

C  * Using SSE2/AVX2 could result in many-fold speedup.

C  * WORKS FOR n mod 4 = 0 ONLY!

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',     `%rdi')

define(`tp',     `%rsi')

define(`n',      `%rdx')

define(`nents',  `%rcx')

define(`which',  `%r8')

define(`i',      `%rbp')

define(`j',      `%r9')

C rax  rbx  rcx  rdx  rdi  rsi  rbp   r8   r9  r10  r11  r12  r13  r14  r15

C          nents  n   rp   tab   i   which j    *    *    *    *    *    *

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

ASM_START()

	TEXT

	ALIGN(16)

PROLOGUE(mpn_sec_tabselect)

	FUNC_ENTRY(4)

IFDOS(`	mov	56(%rsp), %r8d	')

	push	%rbx

	push	%rbp

	push	%r12

	push	%r13

	push	%r14

	push	%r15

	mov	n, j

	add	$-4, j

	js	L(outer_end)

L(outer_top):

	mov	nents, i

	push	tp

	xor	R32(%r12), R32(%r12)

	xor	R32(%r13), R32(%r13)

	xor	R32(%r14), R32(%r14)

	xor	R32(%r15), R32(%r15)

	mov	which, %rbx

	ALIGN(16)

L(top):	sub	$1, %rbx

	sbb	%rax, %rax

	mov	0(tp), %r10

	mov	8(tp), %r11

	and	%rax, %r10

	and	%rax, %r11

	or	%r10, %r12

	or	%r11, %r13

	mov	16(tp), %r10

	mov	24(tp), %r11

	and	%rax, %r10

	and	%rax, %r11

	or	%r10, %r14

	or	%r11, %r15

	lea	(tp,n,8), tp

	add	$-1, i

	jne	L(top)

	mov	%r12, 0(rp)

	mov	%r13, 8(rp)

	mov	%r14, 16(rp)

	mov	%r15, 24(rp)

	pop	tp

	lea	32(tp), tp

	lea	32(rp), rp

	add	$-4, j

	jns	L(outer_top)

L(outer_end):

	test	$2, R8(n)

	jz	L(b0x)

L(b1x):	mov	nents, i

	push	tp

	xor	R32(%r12), R32(%r12)

	xor	R32(%r13), R32(%r13)

	mov	which, %rbx

	ALIGN(16)

L(tp2):	sub	$1, %rbx

	sbb	%rax, %rax

	mov	0(tp), %r10

	mov	8(tp), %r11

	and	%rax, %r10

	and	%rax, %r11

	or	%r10, %r12

	or	%r11, %r13

	lea	(tp,n,8), tp

	add	$-1, i

	jne	L(tp2)

	mov	%r12, 0(rp)

	mov	%r13, 8(rp)

	pop	tp

	lea	16(tp), tp

	lea	16(rp), rp

L(b0x):	test	$1, R8(n)

	jz	L(b00)

L(b01):	mov	nents, i

	xor	R32(%r12), R32(%r12)

	mov	which, %rbx

	ALIGN(16)

L(tp1):	sub	$1, %rbx

	sbb	%rax, %rax

	mov	0(tp), %r10

	and	%rax, %r10

	or	%r10, %r12

	lea	(tp,n,8), tp

	add	$-1, i

	jne	L(tp1)

	mov	%r12, 0(rp)

L(b00):	pop	%r15

	pop	%r14

	pop	%r13

	pop	%r12

	pop	%rbp

	pop	%rbx

	FUNC_EXIT()

	ret

EPILOGUE()