mpeg2enc/predict_mmx.s

   1 ;
   2 ;  predict.s:  mmX optimized block summing differencing routines
   3 ;
   4 ;  Believed to be original Copyright (C) 2000 Brent Byeler
   5 ;
   6 ;  This program is free software; you can reaxstribute it and/or
   7 ;  modify it under the terms of the GNU General Public License
   8 ;  as published by the Free Software Foundation; either version 2
   9 ;  of the License, or (at your option) any later version.
  10 ;
  11 ;  This program is distributed in the hope that it will be useful,
  12 ;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;  GNU General Public License for more details.
  15 ;
  16 ;  You should have received a copy of the GNU General Public License
  17 ;  along with this program; if not, write to the Free Software
  18 ;  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19 ;
  20 ;
  21 ;
  22
  23
  24 ;void sub_pred_mmx(unsigned char *pred,
  25 ;                  unsigned char *cur,
  26 ;                  int lx, short *blk)
  27
  28 align 32
  29 global sub_pred_mmx
  30 sub_pred_mmx:
  31
  32                 push ebp                                ; save frame pointer
  33                 mov ebp, esp            ; link
  34                 push eax
  35                 push ebx
  36                 push ecx
  37                 push esi
  38                 push edi
  39
  40         mov   eax, [ebp+12] ;cur
  41         mov   ebx, [ebp+8]  ;pred
  42         mov   ecx, [ebp+20] ;blk
  43         mov   edi, [ebp+16] ;lx
  44         mov   esi, 8
  45         pxor  mm7, mm7
  46 sub_top:
  47         movq  mm0, [eax]
  48         add   eax, edi
  49         movq  mm2, [ebx]
  50         add   ebx, edi
  51         movq  mm1, mm0
  52         punpcklbw mm0, mm7
  53         punpckhbw mm1, mm7
  54         movq  mm3, mm2
  55         punpcklbw mm2, mm7
  56         punpckhbw mm3, mm7
  57
  58         psubw  mm0, mm2
  59         psubw  mm1, mm3
  60
  61         movq   [ecx], mm0
  62         movq   [ecx+8], mm1
  63         add    ecx, 16
  64
  65         dec    esi
  66         jg     sub_top
  67
  68                 pop edi
  69                 pop esi
  70                 pop ecx
  71                 pop ebx
  72                 pop eax
  73                 pop ebp                 ; restore stack pointer
  74
  75                 emms                    ; clear mmx registers
  76                 ret
  77
  78 ; add prediction and prediction error, saturate to 0...255
  79 ;void add_pred_mmx(unsigned char *pred,
  80 ;                  unsigned char *cur,
  81 ;                  int lx, short *blk)
  82
  83 align 32
  84 global add_pred_mmx
  85 add_pred_mmx:
  86
  87                 push ebp                                ; save frame pointer
  88                 mov ebp, esp            ; link
  89                 push eax
  90                 push ebx
  91                 push ecx
  92                 push esi
  93                 push edi
  94
  95         mov   eax, [ebp+12] ;cur
  96         mov   ebx, [ebp+8]  ;pred
  97         mov   ecx, [ebp+20] ;blk
  98         mov   edi, [ebp+16] ;lx
  99         mov   esi, 8
 100         pxor  mm7, mm7
 101 add_top:
 102         movq  mm0, [ecx]
 103         movq  mm1, [ecx+8]
 104         add   ecx, 16
 105         movq  mm2, [ebx]
 106         add   ebx, edi
 107         movq  mm3, mm2
 108         punpcklbw mm2, mm7
 109         punpckhbw mm3, mm7
 110
 111         paddw  mm0, mm2
 112         paddw  mm1, mm3
 113         packuswb mm0, mm1
 114
 115         movq   [eax], mm0
 116         add    eax, edi
 117
 118         dec    esi
 119         jg     add_top
 120
 121                 pop edi
 122                 pop esi
 123                 pop ecx
 124                 pop ebx
 125                 pop eax
 126                 pop ebp                 ; restore stack pointer
 127
 128                 emms                    ; clear mmx registers
 129                 ret
 130
 131