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dnl x86-64 mpn_lshift optimized for "Core 2".
dnl Copyright 2007, 2009 Free Software Foundation, Inc.
dnl
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
dnl modify it under the terms of the GNU Lesser General Public License as
dnl published by the Free Software Foundation; either version 3 of the
dnl License, or (at your option) any later version.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://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 corei 1.5
C Intel atom ?
C VIA nano ?
C INPUT PARAMETERS
define(`rp', `%rdi')
define(`up', `%rsi')
define(`n', `%rdx')
define(`cnt', `%cl')
ASM_START()
TEXT
ALIGN(16)
PROLOGUE(mpn_lshift)
lea -8(rp,n,8), rp
lea -8(up,n,8), up
mov %edx, %eax
and $3, %eax
jne L(nb00)
L(b00): C n = 4, 8, 12, ...
mov (up), %r10
mov -8(up), %r11
xor %eax, %eax
shld %cl, %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, %eax
jae L(nb01)
L(b01): mov (up), %r9
xor %eax, %eax
shld %cl, %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 %cl, %r9
mov %r9, (rp)
ret
L(nb01):C n = 2, 6, 10, ...
jne L(b11)
L(b10): mov (up), %r8
mov -8(up), %r9
xor %eax, %eax
shld %cl, %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 %cl, %r9, %r8
mov %r8, (rp)
shl %cl, %r9
mov %r9, -8(rp)
ret
ALIGN(16) C performance critical!
L(b11): C n = 3, 7, 11, ...
mov (up), %r11
mov -8(up), %r8
xor %eax, %eax
shld %cl, %r11, %rax
mov -16(up), %r9
lea -24(up), up
sub $4, n
jb L(end)
ALIGN(16)
L(top): shld %cl, %r8, %r11
mov (up), %r10
mov %r11, (rp)
L(10): shld %cl, %r9, %r8
mov -8(up), %r11
mov %r8, -8(rp)
L(01): shld %cl, %r10, %r9
mov -16(up), %r8
mov %r9, -16(rp)
L(00): shld %cl, %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 %cl, %r8, %r11
mov %r11, (rp)
shld %cl, %r9, %r8
mov %r8, -8(rp)
shl %cl, %r9
mov %r9, -16(rp)
ret
EPILOGUE()
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