www.pudn.com > mpeg4_DECORE.rar > deblock_vert_copy_and_unpack.c
/**************************************************************************
* *
* This code has been developed by John Funnell. This software 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 (including Project Mayo), will have no liability for use of *
* this software or modifications or derivatives thereof. *
* *
* Project Mayo gives users of the Codec a license to this software *
* module or modifications thereof for use in hardware or software *
* products claiming conformance to the MPEG-4 Video Standard as *
* described in the Open DivX license. *
* *
* The complete Open DivX license can be found at *
* http://www.projectmayo.com/opendivx/license.php *
* *
**************************************************************************/
/**
* Copyright (C) 2001 - Project Mayo
*
* John Funnell
*
* DivX Advanced Research Center
*
**/
/***
References:
* ISO/IEC 14496-2
* MoMuSys-FDIS-V1.0-990812
* Intel Architecture Software Developer's Manual
Volume 2: Instruction Set Reference
***/
#include "postprocess_mmx.h"
/* John Funnell, December 2000 */
/* function using MMX to copy an 8-pixel wide column and unpack to 16-bit values */
/* n is the number of rows to copy - this muxt be even */
INLINE void deblock_vert_copy_and_unpack(int stride, uint8_t *source, uint64_t *dest, int n) {
uint64_t *pmm1 = (uint64_t *)source;
uint64_t *pmm2 = (uint64_t *)dest;
int i = -n / 2;
#ifdef PP_SELF_CHECK
int j, k;
#endif
/* copy block to local store whilst unpacking to 16-bit values */
__asm {
push edi
push eax
push ebx
mov edi, i
mov eax, pmm1
mov ebx, pmm2
pxor mm7, mm7 /* set mm7 = 0 */
deblock_v_L1: /* now p1 is in mm1 */
movq mm0, [eax] /* mm0 = v[0*stride] */
#ifdef PREFETCH_ENABLE
prefetcht0 0[ebx]
#endif
add eax, stride /* p_data += stride */
movq mm1, mm0 /* mm1 = v[0*stride] */
punpcklbw mm0, mm7 /* unpack low bytes (left hand 4) */
movq mm2, [eax] /* mm2 = v[0*stride] */
punpckhbw mm1, mm7 /* unpack high bytes (right hand 4)*/
movq mm3, mm2 /* mm3 = v[0*stride] */
punpcklbw mm2, mm7 /* unpack low bytes (left hand 4) */
movq [ebx], mm0 /* v_local[n] = mm0 (left) */
add eax, stride /* p_data += stride */
movq 8[ebx], mm1 /* v_local[n+8] = mm1 (right) */
punpckhbw mm3, mm7 /* unpack high bytes (right hand 4)*/
movq 16[ebx], mm2 /* v_local[n+16] = mm2 (left) */
movq 24[ebx], mm3 /* v_local[n+24] = mm3 (right) */
add ebx, 32 /* p_data2 += 8 */
add i, 1 /* increment loop counter */
jne deblock_v_L1
pop ebx
pop eax
pop edi
};
#ifdef PP_SELF_CHECK
/* check that MMX copy has worked correctly */
for (k=0; k