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 1.11 2008-11-26 01:04:34 Isibaar Exp $ |
; * $Id: quantize_mpeg_mmx.asm,v 1.12 2008-11-26 02:21:02 Isibaar Exp $ |
25 |
; * |
; * |
26 |
; *************************************************************************/ |
; *************************************************************************/ |
27 |
|
|
177 |
|
|
178 |
movq mm7, [mmx_rounding] |
movq mm7, [mmx_rounding] |
179 |
|
|
180 |
; QUANT_MMX(0) |
QUANT_MMX(0) |
181 |
; QUANT_MMX(1) |
QUANT_MMX(1) |
182 |
; QUANT_MMX(2) |
QUANT_MMX(2) |
183 |
; QUANT_MMX(3) |
QUANT_MMX(3) |
184 |
; QUANT_MMX(4) |
QUANT_MMX(4) |
185 |
; QUANT_MMX(5) |
QUANT_MMX(5) |
186 |
; QUANT_MMX(6) |
QUANT_MMX(6) |
187 |
; QUANT_MMX(7) |
QUANT_MMX(7) |
188 |
|
|
189 |
; calculate DC |
; calculate DC |
190 |
; 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 |
; xor TMP0, _EDX ; adjust TMP0 according to the sign of data[0] |
xor TMP0, _EDX ; adjust TMP0 according to the sign of data[0] |
196 |
; sub TMP0, _EDX |
sub TMP0, _EDX |
197 |
; add _EAX, TMP0 |
add _EAX, TMP0 |
198 |
|
|
199 |
; mov TMP0, prm4 ; dcscalar |
mov TMP0, prm4 ; dcscalar |
200 |
; idiv TMP0 ; _EAX = _EDX:_EAX / dcscalar |
idiv TMP0 ; _EAX = _EDX:_EAX / dcscalar |
201 |
|
|
202 |
; mov _EDX, prm1 ; coeff again |
mov _EDX, prm1 ; coeff again |
203 |
; mov word [_EDX], ax ; coeff[0] = ax |
mov word [_EDX], ax ; coeff[0] = ax |
204 |
|
|
205 |
xor _EAX, _EAX ; return(0); |
xor _EAX, _EAX ; return(0); |
206 |
ret |
ret |