mpir/mpn/x86_64w/k8/rshift1.asm

; PROLOGUE(rshift1)
;  Version 1.0.4.
;
;  Copyright 2008 Jason Moxham
;
;  Windows Conversion Copyright 2008 Brian Gladman
;
;  This file is part of the MPIR Library.
;  The MPIR Library is free software; you can redistribute it and/or modify
;  it under the terms of the GNU Lesser General Public License as published
;  by the Free Software Foundation; either version 2.1 of the License, or (at
;  your option) any later version.
;  The MPIR Library is distributed in the hope that it will be useful, but
;  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
;  License for more details.
;  You should have received a copy of the GNU Lesser General Public License
;  along with the MPIR Library; see the file COPYING.LIB.  If not, write
;  to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;  Boston, MA 02110-1301, USA.
;
;  mp_limb_t mpn_rshift(mp_ptr, mp_ptr, mp_size_t)
;  rax                     rdi     rsi        rdx
;  rax                     rcx     rdx         r8

%include "yasm_mac.inc"

    CPU  Athlon64
    BITS 64

%define reg_save_list r12, r13

    FRAME_PROC mpn_rshift1, 0, reg_save_list

    xor     rax, rax
    lea     rdx, [rdx+r8*8-8]
    lea     rcx, [rcx+r8*8-8]
    mov     r9, r8
    and     r9, 7
    inc     r9
    shr     r8, 3
; and clear carry flag
    cmp     r8, 0
    jz      .2

    xalign  16
.1:	mov     r10, [rdx]
    mov     r11, [rdx-8]
    mov     r12, [rdx-16]
    mov     r13, [rdx-24]
    rcr     r10, 1
    rcr     r11, 1
    rcr     r12, 1
    rcr     r13, 1
    mov     [rcx], r10
    mov     [rcx-8], r11
    mov     [rcx-16], r12
    mov     [rcx-24], r13
    mov     r10, [rdx-32]
    mov     r11, [rdx-40]
    mov     r12, [rdx-48]
    mov     r13, [rdx-56]
    rcr     r10, 1
    rcr     r11, 1
    rcr     r12, 1
    rcr     r13, 1
    mov     [rcx-32], r10
    mov     [rcx-40], r11
    mov     [rcx-48], r12
    mov     [rcx-56], r13
    lea     rdx, [rdx-64]
    dec     r8
    lea     rcx, [rcx-64]
    jnz     .1
.2: dec     r9
    jz      .3
; Could suffer cache-bank conflicts in this tail part
    mov     r10, [rdx]
    rcr     r10, 1
    mov     [rcx], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-8]
    rcr     r10, 1
    mov     [rcx-8], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-16]
    rcr     r10, 1
    mov     [rcx-16], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-24]
    rcr     r10, 1
    mov     [rcx-24], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-32]
    rcr     r10, 1
    mov     [rcx-32], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-40]
    rcr     r10, 1
    mov     [rcx-40], r10
    dec     r9
    jz      .3
    mov     r10, [rdx-48]
    rcr     r10, 1
    mov     [rcx-48], r10
.3: rcr     rax, 1
    END_PROC reg_save_list

    end