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dnl AMD64 mpn_rshift -- mpn right shift.
dnl Copyright 2003, 2005, 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 2.375
C AMD K10 2.375
C Intel P4 8
C Intel core2 2.11
C Intel corei ?
C Intel atom 5.75
C VIA nano 3.5
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(32)
PROLOGUE(mpn_rshift)
FUNC_ENTRY(4)
neg R32(%rcx) C put rsh count in cl
mov (up), %rax
shl R8(%rcx), %rax C function return value
neg R32(%rcx) C put lsh count in cl
lea 1(n), R32(%r8)
lea -8(up,n,8), up
lea -8(rp,n,8), rp
neg n
and $3, R32(%r8)
je L(rlx) C jump for n = 3, 7, 11, ...
dec R32(%r8)
jne L(1)
C n = 4, 8, 12, ...
mov 8(up,n,8), %r10
shr R8(%rcx), %r10
neg R32(%rcx) C put rsh count in cl
mov 16(up,n,8), %r8
shl R8(%rcx), %r8
or %r8, %r10
mov %r10, 8(rp,n,8)
inc n
jmp L(rll)
L(1): dec R32(%r8)
je L(1x) C jump for n = 1, 5, 9, 13, ...
C n = 2, 6, 10, 16, ...
mov 8(up,n,8), %r10
shr R8(%rcx), %r10
neg R32(%rcx) C put rsh count in cl
mov 16(up,n,8), %r8
shl R8(%rcx), %r8
or %r8, %r10
mov %r10, 8(rp,n,8)
inc n
neg R32(%rcx) C put lsh count in cl
L(1x):
cmp $-1, n
je L(ast)
mov 8(up,n,8), %r10
shr R8(%rcx), %r10
mov 16(up,n,8), %r11
shr R8(%rcx), %r11
neg R32(%rcx) C put rsh count in cl
mov 16(up,n,8), %r8
mov 24(up,n,8), %r9
shl R8(%rcx), %r8
or %r8, %r10
shl R8(%rcx), %r9
or %r9, %r11
mov %r10, 8(rp,n,8)
mov %r11, 16(rp,n,8)
add $2, n
L(rll): neg R32(%rcx) C put lsh count in cl
L(rlx): mov 8(up,n,8), %r10
shr R8(%rcx), %r10
mov 16(up,n,8), %r11
shr R8(%rcx), %r11
add $4, n C 4
jb L(end) C 2
ALIGN(16)
L(top):
C finish stuff from lsh block
neg R32(%rcx) C put rsh count in cl
mov -16(up,n,8), %r8
mov -8(up,n,8), %r9
shl R8(%rcx), %r8
or %r8, %r10
shl R8(%rcx), %r9
or %r9, %r11
mov %r10, -24(rp,n,8)
mov %r11, -16(rp,n,8)
C start two new rsh
mov (up,n,8), %r8
mov 8(up,n,8), %r9
shl R8(%rcx), %r8
shl R8(%rcx), %r9
C finish stuff from rsh block
neg R32(%rcx) C put lsh count in cl
mov -8(up,n,8), %r10
mov 0(up,n,8), %r11
shr R8(%rcx), %r10
or %r10, %r8
shr R8(%rcx), %r11
or %r11, %r9
mov %r8, -8(rp,n,8)
mov %r9, 0(rp,n,8)
C start two new lsh
mov 8(up,n,8), %r10
mov 16(up,n,8), %r11
shr R8(%rcx), %r10
shr R8(%rcx), %r11
add $4, n
jae L(top) C 2
L(end):
neg R32(%rcx) C put rsh count in cl
mov -8(up), %r8
shl R8(%rcx), %r8
or %r8, %r10
mov (up), %r9
shl R8(%rcx), %r9
or %r9, %r11
mov %r10, -16(rp)
mov %r11, -8(rp)
neg R32(%rcx) C put lsh count in cl
L(ast): mov (up), %r10
shr R8(%rcx), %r10
mov %r10, (rp)
FUNC_EXIT()
ret
EPILOGUE()
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