[svn] / trunk / xvidcore / src / quant / x86_asm / quantize_mpeg_mmx.asm Repository:
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revision 1844, Thu Dec 4 14:41:50 2008 UTC revision 1845, Thu Dec 4 18:30:36 2008 UTC
# Line 21  Line 21 
21  ; *  along with this program ; if not, write to the Free Software  ; *  along with this program ; if not, write to the Free Software
22  ; *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  ; *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23  ; *  ; *
24  ; * $Id: quantize_mpeg_mmx.asm,v 1.14 2008-12-04 14:41:50 Isibaar Exp $  ; * $Id: quantize_mpeg_mmx.asm,v 1.15 2008-12-04 18:30:36 Isibaar Exp $
25  ; *  ; *
26  ; *************************************************************************/  ; *************************************************************************/
27    
# Line 187  Line 187 
187    QUANT_MMX(7)    QUANT_MMX(7)
188    
189    ; calculate DC    ; calculate DC
190    XVID_MOVSX _EAX, word [_EAX]   ; data[0]    movsx _EAX, word [_EAX]  ; data[0]
191    mov TMP0, prm4            ; dcscalar    mov TMP0, prm4            ; dcscalar
192    mov _EDX, _EAX    mov _EDX, _EAX
193    shr TMP0, 1               ; TMP0 = dcscalar/2    shr TMP0, 1               ; TMP0 = dcscalar/2
194    sar _EDX, 31              ; TMP1 = sign extend of _EAX (ready for division too)    sar _EDX, 31              ; TMP1 = sign extend of _EAX (ready for division too)
195    
196    xor TMP0, _EDX            ; adjust TMP0 according to the sign of data[0]    xor TMP0, _EDX            ; adjust TMP0 according to the sign of data[0]
197    sub TMP0, _EDX    sub TMP0, _EDX
198    add _EAX, TMP0    add _EAX, TMP0
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