PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 331

• Manufacturer Part Number: PNX1301
• Description: Media Processors
• Manufacturer: PHILIPS [NXP Semiconductors]

PNX1300/01/02/11 Data Book
dspuquadaddui
SYNTAX
FUNCTION
DESCRIPTION
8-bit bytes of rsrc1 and rsrc2. The bytes in rsrc1 are considered unsigned values; the bytes in rsrc2 are considered
signed. The four sums are clipped into the unsigned range [255..0] (or [0xff..0]); thus, the final byte sums are
unsigned. All computations are performed without loss of precision.
controls the modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not
changed.
EXAMPLES
A-33
r30 = 0x02010001, r40 = 0xffffff01
r10 = 0, r60 = 0x9c9c6464, r70 = 0x649c649c
r20 = 1, r60 = 0x9c9c6464, r70 = 0x649c649c
As shown below, the
The
[ IF rguard ] dspuquadaddui rsrc1 rsrc2
if rguard then {
}
rsrc1
for (i
}
31
dspuquadaddui
temp
if temp < 0 then
else if temp > 0xff then
else rdest<m:n>
unsigned
rdest<m:n>
rdest<m:n>
10-bit signed sums
Four full-precision
0, m
zero_ext8to32(rsrc1<m:n>) + sign_ext8to32(rsrc2<m:n>)
Initial Values
23
31, n
unsigned
0
0xff
dspuquadaddui
PRELIMINARY SPECIFICATION
temp<7:0>
24; i < 4; i
9
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB
Clip to [255..0]
15
signed
unsigned
rdest
31
i + 1, m
unsigned
0
7
dspuquadaddui r30 r40
IF r10 dspuquadaddui r60 r70
IF r20 dspuquadaddui r60 r70
unsigned
operation computes four separate sums of the four pairs of corresponding
9
Clip to [255..0]
Quad clipped add of unsigned/signed bytes
m – 8, n
23
signed
unsigned
0
0
n – 8) {
15
rdest
9
unsigned
rsrc2
Operation
Clip to [255..0]
signed
31
signed
7
unsigned
0
r50
23
9
Clip to [255..0]
signed
0
signed
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
r90
Philips Semiconductors
15
0
signed
dspidualadd
ATTRIBUTES
r50
no change, since guard is
false
r90
SEE ALSO
0x01000002
0xff38c800
7
Result
signed
dspalu
1, 3
No
78
—
0
2
2