dnl  AMD64 mpn_popcount -- population count.

dnl  Copyright 2008, 2010-2013 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 AMD K8,K9		 n/a

C AMD K10		 1.5		slower than 8-way non-pipelined code

C AMD bd1		 4.2

C AMD bobcat		 6.28		slower than 8-way non-pipelined code

C Intel P4		 n/a

C Intel core2		 n/a

C Intel NHM		 1.32

C Intel SBR		 1.05		fluctuating

C Intel IBR		 1.05		fluctuating

C Intel HSW		 1

C Intel atom		 n/a

C VIA nano		 n/a

define(`up',		`%rdi')

define(`n_param',	`%rsi')

define(`n',		`%rcx')

ABI_SUPPORT(DOS64)

ABI_SUPPORT(STD64)

ASM_START()

	TEXT

	ALIGN(32)

PROLOGUE(mpn_popcount)

	FUNC_ENTRY(2)

	lea	(up,n_param,8), up

	xor	R32(%rax), R32(%rax)

	test	$1, R8(n_param)

	jnz	L(bx1)

L(bx0):	test	$2, R8(n_param)

	jnz	L(b10)

L(b00):	mov	$0, R32(n)

	sub	n_param, n

	.byte	0xf3,0x4c,0x0f,0xb8,0x04,0xcf		C popcnt (up,n,8), %r8

	.byte	0xf3,0x4c,0x0f,0xb8,0x4c,0xcf,0x08	C popcnt 8(up,n,8), %r9

	jmp	L(lo0)

L(b10):	mov	$2, R32(n)

	sub	n_param, n

	.byte	0xf3,0x4c,0x0f,0xb8,0x54,0xcf,0xf0	C popcnt -16(up,n,8), %r10

	.byte	0xf3,0x4c,0x0f,0xb8,0x5c,0xcf,0xf8	C popcnt -8(up,n,8), %r11

	test	n, n

	jz	L(cj2)

	jmp	L(lo2)

L(bx1):	test	$2, R8(n_param)

	jnz	L(b11)

L(b01):	mov	$1, R32(n)

	sub	n_param, n

	.byte	0xf3,0x4c,0x0f,0xb8,0x5c,0xcf,0xf8	C popcnt -8(up,n,8), %r11

	test	n, n

	jz	L(cj1)

	.byte	0xf3,0x4c,0x0f,0xb8,0x04,0xcf		C popcnt 0(up,n,8), %r8

	jmp	L(lo1)

L(b11):	mov	$-1, n

	sub	n_param, n

	.byte	0xf3,0x4c,0x0f,0xb8,0x4c,0xcf,0x08	C popcnt 8(up,n,8), %r9

	.byte	0xf3,0x4c,0x0f,0xb8,0x54,0xcf,0x10	C popcnt 16(up,n,8), %r10

	jmp	L(lo3)

	ALIGN(32)

L(top):	add	%r9, %rax

L(lo2):	.byte	0xf3,0x4c,0x0f,0xb8,0x04,0xcf		C popcnt 0(up,n,8), %r8

	add	%r10, %rax

L(lo1):	.byte	0xf3,0x4c,0x0f,0xb8,0x4c,0xcf,0x08	C popcnt 8(up,n,8), %r9

	add	%r11, %rax

L(lo0):	.byte	0xf3,0x4c,0x0f,0xb8,0x54,0xcf,0x10	C popcnt 16(up,n,8), %r10

	add	%r8, %rax

L(lo3):	.byte	0xf3,0x4c,0x0f,0xb8,0x5c,0xcf,0x18	C popcnt 24(up,n,8), %r11

	add	$4, n

	js	L(top)

L(end):	add	%r9, %rax

L(cj2):	add	%r10, %rax

L(cj1):	add	%r11, %rax

	FUNC_EXIT()

	ret

EPILOGUE()

CF_PROT