cbp_3dne.asm

这是一个压缩解压包,用C语言进行编程的,里面有详细的源代码.

;/****************************************************************************
; *
; *  XVID MPEG-4 VIDEO CODEC
; *  - 3dne CBP computation -
; *
; *  Copyright (C) 2002 Jaan Kalda
; *
; *  This program is free software ; you can redistribute it and/or modify
; *  it under the terms of the GNU General Public License as published by
; *  the Free Software Foundation ; either version 2 of the License, or
; *  (at your option) any later version.
; *
; *  This program 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 General Public License for more details.
; *
; *  You should have received a copy of the GNU General Public License
; *  along with this program ; if not, write to the Free Software
; *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
; *
; * $Id: cbp_3dne.asm,v 1.5 2004/08/29 10:02:38 edgomez Exp $
; *
; ***************************************************************************/

; these 3dne functions are compatible with iSSE, but are optimized
; specifically for K7 pipelines

BITS 32

;=============================================================================
; Macros
;=============================================================================

%macro cglobal 1
	%ifdef PREFIX
		%ifdef MARK_FUNCS
			global _%1:function %1.endfunc-%1
			%define %1 _%1:function %1.endfunc-%1
		%else
			global _%1
			%define %1 _%1
		%endif
	%else
		%ifdef MARK_FUNCS
			global %1:function %1.endfunc-%1
		%else
			global %1
		%endif
	%endif
%endmacro

%macro calc_cbp 1
  pshufw mm0, [eax], 229 ; =11100101
  movq mm1, [eax+8]
  por mm0, [eax+64]
  por mm1, [eax+72]
  movq mm2, [eax+16]
  movq mm3, [eax+24]
  por mm2, [eax+80]
  por mm3, [eax+88]
  movq mm4, [eax+32]
  movq mm5, [eax+40]
  por mm4, [eax+96]
  por mm5, [eax+104]
  movq mm6, [eax+48]
  movq mm7, [eax+56]
  por mm6, [eax+112]
  por mm7, [eax+120]
  por mm1, mm0
%if %1
  sub eax, byte -128 ;ecx ;+= 128; needed 3 bytes for alignment
%else
  xor eax, eax
  xor edx, edx
%endif
  por mm3, mm2
  por mm5, mm4
  por mm7, mm6
  por mm3, mm1
  por mm7, mm5
  por mm7, mm3
  packsswb mm7, mm7
  movd [esp+%1*4], mm7
%endmacro

;=============================================================================
; Code
;=============================================================================

SECTION .text

cglobal calc_cbp_3dne

;-----------------------------------------------------------------------------
; uint32_t calc_cbp_3dne(const int16_t coeff[6*64]);
;-----------------------------------------------------------------------------
;AMD K7, in cache: ca 80 clk

ALIGN 16
calc_cbp_3dne:
  mov eax, [esp+ 4]	; coeff
  lea esp, [esp-24]
  calc_cbp 5 ;bit 5
  calc_cbp 4 ;b4
  calc_cbp 3 ;b3
  calc_cbp 2 ;b2
  calc_cbp 1 ;b1
  calc_cbp 0 ;b0
  cmp eax, [esp+5*4]
  adc eax, eax
  cmp edx, [esp+4*4]
  adc eax, eax
  cmp edx, [esp+3*4]
  adc eax, eax
  cmp edx, [esp+2*4]
  adc eax, eax
  cmp edx, [esp+1*4]
  adc eax, eax
  cmp edx, [esp+0*4]
  adc eax, eax
  add esp, byte 24
  ret
.endfunc