dnl x86-64 mpn_lshift optimized for "Core 2".
dnl Copyright 2007, 2009, 2011, 2012 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 4.25
C AMD K10 4.25
C Intel P4 14.7
C Intel core2 1.27
C Intel NHM 1.375 (up to about n = 260, then 1.5)
C Intel SBR 1.87
C Intel atom ?
C VIA nano ?
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`n', `%rdx')
define(`cnt', `%rcx')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_lshift)
FUNC_ENTRY(4)
lea -8(rp,n,8), rp
lea -8(up,n,8), up
mov R32(%rdx), R32(%rax)
and $3, R32(%rax)
jne L(nb00)
L(b00): C n = 4, 8, 12, ...
mov (up), %r10
mov -8(up), %r11
xor R32(%rax), R32(%rax)
shld R8(cnt), %r10, %rax
mov -16(up), %r8
lea 24(rp), rp
sub $4, n
jmp L(00)
L(nb00):C n = 1, 5, 9, ...
cmp $2, R32(%rax)
jae L(nb01)
L(b01): mov (up), %r9
xor R32(%rax), R32(%rax)
shld R8(cnt), %r9, %rax
sub $2, n
jb L(le1)
mov -8(up), %r10
mov -16(up), %r11
lea -8(up), up
lea 16(rp), rp
jmp L(01)
L(le1): shl R8(cnt), %r9
mov %r9, (rp)
FUNC_EXIT()
ret
L(nb01):C n = 2, 6, 10, ...
jne L(b11)
L(b10): mov (up), %r8
mov -8(up), %r9
xor R32(%rax), R32(%rax)
shld R8(cnt), %r8, %rax
sub $3, n
jb L(le2)
mov -16(up), %r10
lea -16(up), up
lea 8(rp), rp
jmp L(10)
L(le2): shld R8(cnt), %r9, %r8
mov %r8, (rp)
shl R8(cnt), %r9
mov %r9, -8(rp)
FUNC_EXIT()
ret
ALIGN(16) C performance critical!
L(b11): C n = 3, 7, 11, ...
mov (up), %r11
mov -8(up), %r8
xor R32(%rax), R32(%rax)
shld R8(cnt), %r11, %rax
mov -16(up), %r9
lea -24(up), up
sub $4, n
jb L(end)
ALIGN(16)
L(top): shld R8(cnt), %r8, %r11
mov (up), %r10
mov %r11, (rp)
L(10): shld R8(cnt), %r9, %r8
mov -8(up), %r11
mov %r8, -8(rp)
L(01): shld R8(cnt), %r10, %r9
mov -16(up), %r8
mov %r9, -16(rp)
L(00): shld R8(cnt), %r11, %r10
mov -24(up), %r9
mov %r10, -24(rp)
add $-32, up
lea -32(rp), rp
sub $4, n
jnc L(top)
L(end): shld R8(cnt), %r8, %r11
mov %r11, (rp)
shld R8(cnt), %r9, %r8
mov %r8, -8(rp)
shl R8(cnt), %r9
mov %r9, -16(rp)
FUNC_EXIT()
ret
EPILOGUE()
CF_PROT