128 lines
2.9 KiB
NASM
128 lines
2.9 KiB
NASM
|
|
; AMD64 mpn_rshift -- mpn right shift
|
|
; Version 1.0.3.
|
|
;
|
|
; 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.
|
|
;
|
|
; Calling interface:
|
|
;
|
|
; mp_limb_t mpn_rshift(
|
|
; mp_ptr dst, rcx
|
|
; mp_srcptr src, rdx
|
|
; mp_size_t size, r8
|
|
; unsigned shift r9
|
|
; )
|
|
;
|
|
; This is an SEH leaf function (no unwind support needed)
|
|
|
|
bits 64
|
|
section .text
|
|
|
|
global __gmpn_rshift
|
|
|
|
%ifdef DLL
|
|
export __gmpn_rshift
|
|
%endif
|
|
|
|
__gmpn_rshift:
|
|
mov r8d, r8d
|
|
mov r9d, r9d
|
|
mov eax, 64
|
|
lea rdx, [rdx+r8*8-32]
|
|
lea rcx, [rcx+r8*8-32]
|
|
sub rax, r9
|
|
movq mm0, r9
|
|
mov r9d, 4
|
|
sub r9, r8
|
|
movq mm1, rax
|
|
movq mm5, [rdx+r9*8]
|
|
movq mm3, mm5
|
|
psllq mm5, mm1
|
|
movq rax, mm5
|
|
psrlq mm3, mm0
|
|
jnc .2
|
|
|
|
alignb 16, nop
|
|
.1: movq mm2, [rdx+r9*8+8]
|
|
movq mm4, mm2
|
|
psllq mm2, mm1
|
|
por mm3, mm2
|
|
movq [rcx+r9*8], mm3
|
|
psrlq mm4, mm0
|
|
movq mm5, [rdx+r9*8+16]
|
|
movq mm3, mm5
|
|
psllq mm5, mm1
|
|
por mm4, mm5
|
|
movq [rcx+r9*8+8], mm4
|
|
psrlq mm3, mm0
|
|
|
|
; got room here for another jump out , if we can arrange our r9 to be
|
|
; slightly different , so we can use a jz or jp here
|
|
|
|
movq mm2, [rdx+r9*8+24]
|
|
movq mm4, mm2
|
|
psllq mm2, mm1
|
|
por mm3, mm2
|
|
movq [rcx+r9*8+16], mm3
|
|
psrlq mm4, mm0
|
|
movq mm5, [rdx+r9*8+32]
|
|
movq mm3, mm5
|
|
psllq mm5, mm1
|
|
por mm4, mm5
|
|
movq [rcx+r9*8+24], mm4
|
|
psrlq mm3, mm0
|
|
add r9, 4
|
|
jnc .1
|
|
|
|
; r9 is 0,1,2,3 here , so we have 3-r9 limbs to do
|
|
|
|
.2: test r9, 2
|
|
jnz .3
|
|
movq mm2, [rdx+r9*8+8]
|
|
movq mm4, mm2
|
|
psllq mm2, mm1
|
|
por mm3, mm2
|
|
movq [rcx+r9*8], mm3
|
|
psrlq mm4, mm0
|
|
movq mm5, [rdx+r9*8+16]
|
|
movq mm3, mm5
|
|
psllq mm5, mm1
|
|
por mm4, mm5
|
|
movq [rcx+r9*8+8], mm4
|
|
psrlq mm3, mm0
|
|
add r9, 2
|
|
|
|
.3: test r9, 1
|
|
jnz .4
|
|
movq mm2, [rdx+r9*8+8]
|
|
movq mm4, mm2
|
|
psllq mm2, mm1
|
|
por mm3, mm2
|
|
movq [rcx+r9*8], mm3
|
|
psrlq mm4, mm0
|
|
movq [rcx+r9*8+8], mm4
|
|
emms
|
|
ret
|
|
|
|
.4: movq [rcx+r9*8], mm3
|
|
emms
|
|
ret
|
|
|
|
end
|