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dnl x86-64 mpn_lshift optimized for Pentium 4.
dnl Copyright 2003, 2005, 2007, 2008 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 2.5
C AMD K10 ?
C Intel P4 3.29
C Intel core2 2.1 (fluctuates, presumably cache related)
C Intel corei ?
C Intel atom 14.3
C VIA nano ?
C INPUT PARAMETERS
define(`rp',`%rdi')
define(`up',`%rsi')
define(`n',`%rdx')
define(`cnt',`%cl')
ABI_SUPPORT(DOS64)
ABI_SUPPORT(STD64)
ASM_START()
TEXT
ALIGN(32)
PROLOGUE(mpn_lshift)
DOS64_ENTRY(4)
mov -8(up,n,8), %rax
movd R32(%rcx), %mm4
neg R32(%rcx) C put rsh count in cl
and $63, R32(%rcx)
movd R32(%rcx), %mm5
lea 1(n), R32(%r8)
shr R8(%rcx), %rax C function return value
and $3, R32(%r8)
je L(rol) C jump for n = 3, 7, 11, ...
dec R32(%r8)
jne L(1)
C n = 4, 8, 12, ...
movq -8(up,n,8), %mm2
psllq %mm4, %mm2
movq -16(up,n,8), %mm0
psrlq %mm5, %mm0
por %mm0, %mm2
movq %mm2, -8(rp,n,8)
dec n
jmp L(rol)
L(1): dec R32(%r8)
je L(1x) C jump for n = 1, 5, 9, 13, ...
C n = 2, 6, 10, 16, ...
movq -8(up,n,8), %mm2
psllq %mm4, %mm2
movq -16(up,n,8), %mm0
psrlq %mm5, %mm0
por %mm0, %mm2
movq %mm2, -8(rp,n,8)
dec n
L(1x):
cmp $1, n
je L(ast)
movq -8(up,n,8), %mm2
psllq %mm4, %mm2
movq -16(up,n,8), %mm3
psllq %mm4, %mm3
movq -16(up,n,8), %mm0
movq -24(up,n,8), %mm1
psrlq %mm5, %mm0
por %mm0, %mm2
psrlq %mm5, %mm1
por %mm1, %mm3
movq %mm2, -8(rp,n,8)
movq %mm3, -16(rp,n,8)
sub $2, n
L(rol): movq -8(up,n,8), %mm2
psllq %mm4, %mm2
movq -16(up,n,8), %mm3
psllq %mm4, %mm3
sub $4, n C 4
jb L(end) C 2
ALIGN(32)
L(top):
C finish stuff from lsh block
movq 16(up,n,8), %mm0
movq 8(up,n,8), %mm1
psrlq %mm5, %mm0
por %mm0, %mm2
psrlq %mm5, %mm1
movq (up,n,8), %mm0
por %mm1, %mm3
movq -8(up,n,8), %mm1
movq %mm2, 24(rp,n,8)
movq %mm3, 16(rp,n,8)
C start two new rsh
psrlq %mm5, %mm0
psrlq %mm5, %mm1
C finish stuff from rsh block
movq 8(up,n,8), %mm2
movq (up,n,8), %mm3
psllq %mm4, %mm2
por %mm2, %mm0
psllq %mm4, %mm3
movq -8(up,n,8), %mm2
por %mm3, %mm1
movq -16(up,n,8), %mm3
movq %mm0, 8(rp,n,8)
movq %mm1, (rp,n,8)
C start two new lsh
sub $4, n
psllq %mm4, %mm2
psllq %mm4, %mm3
jae L(top) C 2
L(end):
movq 8(up), %mm0
psrlq %mm5, %mm0
por %mm0, %mm2
movq (up), %mm1
psrlq %mm5, %mm1
por %mm1, %mm3
movq %mm2, 16(rp)
movq %mm3, 8(rp)
L(ast): movq (up), %mm2
psllq %mm4, %mm2
movq %mm2, (rp)
emms
DOS64_EXIT()
ret
EPILOGUE()
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