transfer_mmx.asm

quicktime linux播放器v1

;/**************************************************************************
; *
; *	XVID MPEG-4 VIDEO CODEC
; *	mmx 8bit<->16bit transfer
; *
; *	This program is an implementation of a part of one or more MPEG-4
; *	Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
; *	to use this software module in hardware or software products are
; *	advised that its use may infringe existing patents or copyrights, and
; *	any such use would be at such party's own risk.  The original
; *	developer of this software module and his/her company, and subsequent
; *	editors and their companies, will have no liability for use of this
; *	software or modifications or derivatives thereof.
; *
; *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
; *
; *************************************************************************/

;/**************************************************************************
; *
; *	History:
; *
; *	17.11.2001	bug fix: code declared as .data
; *	07.11.2001	initial version; (c)2001 peter ross <[e-mail]>
; *
; *************************************************************************/


bits 32


section .text


;===========================================================================
;
; void transfer_8to16copy_mmx(int16_t * const dst,
;							const uint8_t * const src,
;							uint32_t stride);
;
;===========================================================================

align 16
global _transfer_8to16copy_mmx
_transfer_8to16copy_mmx

		push	esi
		push	edi

		mov	edi, [esp + 8 + 4]		; dst
		mov	esi, [esp + 8 + 8]		; src
		mov ecx, [esp + 8 + 12]		; stride

		pxor mm7, mm7				; mm7 = zero
			
		mov eax, 8

.loop
		movq mm0, [esi]
		movq mm1, mm0
		punpcklbw mm0, mm7		; mm01 = unpack([src])
		punpckhbw mm1, mm7
		
		movq [edi], mm0			; [dst] = mm01
		movq [edi + 8], mm1

		add edi, 16
		add esi, ecx
		dec eax
		jnz .loop

		pop edi
		pop esi

		ret



;===========================================================================
;
; void transfer_16to8copy_mmx(uint8_t * const dst,
;							const int16_t * const src,
;							uint32_t stride);
;
;===========================================================================

align 16
global _transfer_16to8copy_mmx
_transfer_16to8copy_mmx

		push	esi
		push	edi

		mov	edi, [esp + 8 + 4]		; dst
		mov	esi, [esp + 8 + 8]		; src
		mov ecx, [esp + 8 + 12]		; stride

		mov eax, 8

.loop
		movq mm0, [esi]
		packuswb mm0, [esi + 8]		; mm0 = pack([src])
		
		movq [edi], mm0				; [dst] = mm0

		add esi, 16
		add edi, ecx
		dec eax
		jnz .loop

		pop edi
		pop esi

		ret


;===========================================================================
;
; void transfer_16to8add_mmx(uint8_t * const dst,
;						const int16_t * const src,
;						uint32_t stride);
;
;===========================================================================

align 16
global _transfer_16to8add_mmx
_transfer_16to8add_mmx

		push	esi
		push	edi

		mov	edi, [esp + 8 + 4]		; dst
		mov	esi, [esp + 8 + 8]		; src
		mov ecx, [esp + 8 + 12]		; stride

		pxor mm7, mm7

		mov eax, 8

.loop
		movq mm0, [edi]			
		movq mm1, mm0
		punpcklbw mm0, mm7		; mm23 = unpack([dst])
		punpckhbw mm1, mm7

		movq mm2, [esi]			; mm01 = [src]
		movq mm3, [esi + 8]

		paddsw mm0, mm2			; mm01 += mm23
		paddsw mm1, mm3

		packuswb mm0, mm1		; [dst] = pack(mm01)
		movq [edi], mm0

		add esi, 16
		add edi, ecx
		dec eax
		jnz .loop

		pop edi
		pop esi

		ret