beta-0.89.2

[luatex.git] / source / libs / gmp / gmp-src / mpn / x86_64 / lshiftc.asm

dnl  AMD64 mpn_lshiftc -- mpn left shift with complement.

dnl  Copyright 2003, 2005, 2006, 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      2.75
C AMD K10        2.75
C Intel P4       ?
C Intel core2    ?
C Intel corei    ?
C Intel atom     ?
C VIA nano       3.75


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_lshiftc)
        FUNC_ENTRY(4)
        neg     R32(%rcx)               C put rsh count in cl
        mov     -8(up,n,8), %rax
        shr     R8(%rcx), %rax          C function return value

        neg     R32(%rcx)               C put lsh count in cl
        lea     1(n), R32(%r8)
        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
        shl     R8(%rcx), %r10
        neg     R32(%rcx)               C put rsh count in cl
        mov     -16(up,n,8), %r8
        shr     R8(%rcx), %r8
        or      %r8, %r10
        not     %r10
        mov     %r10, -8(rp,n,8)
        dec     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
        shl     R8(%rcx), %r10
        neg     R32(%rcx)               C put rsh count in cl
        mov     -16(up,n,8), %r8
        shr     R8(%rcx), %r8
        or      %r8, %r10
        not     %r10
        mov     %r10, -8(rp,n,8)
        dec     n
        neg     R32(%rcx)               C put lsh count in cl
L(1x):
        cmp     $1, n
        je      L(ast)
        mov     -8(up,n,8), %r10
        shl     R8(%rcx), %r10
        mov     -16(up,n,8), %r11
        shl     R8(%rcx), %r11
        neg     R32(%rcx)               C put rsh count in cl
        mov     -16(up,n,8), %r8
        mov     -24(up,n,8), %r9
        shr     R8(%rcx), %r8
        or      %r8, %r10
        shr     R8(%rcx), %r9
        or      %r9, %r11
        not     %r10
        not     %r11
        mov     %r10, -8(rp,n,8)
        mov     %r11, -16(rp,n,8)
        sub     $2, n

L(rll): neg     R32(%rcx)               C put lsh count in cl
L(rlx): mov     -8(up,n,8), %r10
        shl     R8(%rcx), %r10
        mov     -16(up,n,8), %r11
        shl     R8(%rcx), %r11

        sub     $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
        shr     R8(%rcx), %r8
        or      %r8, %r10
        shr     R8(%rcx), %r9
        or      %r9, %r11
        not     %r10
        not     %r11
        mov     %r10, 24(rp,n,8)
        mov     %r11, 16(rp,n,8)
        C start two new rsh
        mov     0(up,n,8), %r8
        mov     -8(up,n,8), %r9
        shr     R8(%rcx), %r8
        shr     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
        shl     R8(%rcx), %r10
        or      %r10, %r8
        shl     R8(%rcx), %r11
        or      %r11, %r9
        not     %r8
        not     %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
        shl     R8(%rcx), %r10
        shl     R8(%rcx), %r11

        sub     $4, n
        jae     L(top)                  C                                     2
L(end):
        neg     R32(%rcx)               C put rsh count in cl
        mov     8(up), %r8
        shr     R8(%rcx), %r8
        or      %r8, %r10
        mov     (up), %r9
        shr     R8(%rcx), %r9
        or      %r9, %r11
        not     %r10
        not     %r11
        mov     %r10, 16(rp)
        mov     %r11, 8(rp)

        neg     R32(%rcx)               C put lsh count in cl
L(ast): mov     (up), %r10
        shl     R8(%rcx), %r10
        not     %r10
        mov     %r10, (rp)
        FUNC_EXIT()
        ret
EPILOGUE()