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