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dnl AMD64 mpn_lshift -- mpn left shift, optimised for Atom.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2011 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 ?
C AMD K10 ?
C Intel P4 ?
C Intel core2 ?
C Intel NHM ?
C Intel SBR ?
C Intel atom 4.5
C VIA nano ?
C TODO
C * Consider using 4-way unrolling. We reach 4 c/l, but the code is 2.5 times
C larger.
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)
DOS64_ENTRY(4)
lea -8(up,n,8), up
lea -8(rp,n,8), rp
shr R32(n)
mov (up), %rax
jnc L(evn)
mov %rax, %r11
shl R8(%rcx), %r11
neg R8(%rcx)
shr R8(%rcx), %rax
test n, n
jnz L(gt1)
mov %r11, (rp)
DOS64_EXIT()
ret
L(gt1): mov -8(up), %r8
mov %r8, %r10
shr R8(%rcx), %r8
jmp L(lo1)
L(evn): mov %rax, %r10
neg R8(%rcx)
shr R8(%rcx), %rax
mov -8(up), %r9
mov %r9, %r11
shr R8(%rcx), %r9
neg R8(%rcx)
dec n
lea 8(rp), rp
lea -8(up), up
jz L(end)
ALIGN(8)
L(top): shl R8(%rcx), %r10
or %r10, %r9
shl R8(%rcx), %r11
neg R8(%rcx)
mov -8(up), %r8
mov %r8, %r10
mov %r9, -8(rp)
shr R8(%rcx), %r8
lea -16(rp), rp
L(lo1): mov -16(up), %r9
or %r11, %r8
mov %r9, %r11
shr R8(%rcx), %r9
lea -16(up), up
neg R8(%rcx)
mov %r8, (rp)
dec n
jg L(top)
L(end): shl R8(%rcx), %r10
or %r10, %r9
shl R8(%rcx), %r11
mov %r9, -8(rp)
mov %r11, -16(rp)
DOS64_EXIT()
ret
EPILOGUE()
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