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 |