PNX1300 Philips, PNX1300 Datasheet - Page 441

• Manufacturer Part Number: PNX1300
• Description: Media Processors
• Manufacturer: Philips

PNX1300/01/02/11 Data Book
packbytes
SYNTAX
FUNCTION
DESCRIPTION
rsrc2 into rdest. The byte from rsrc1 is packed into the second-least-significant byte of rdest; the byte from rsrc2 is
packed into the least-significant byte of rdest. The two most-significant bytes of rdest are filled with zeros.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is unchanged.
EXAMPLES
A-143
r30 = 0x12345678, r40 = 0xaabbccdd
r10 = 0, r40 = 0xaabbccdd, r30 = 0x12345678
r20 = 1, r40 = 0xaabbccdd, r30 = 0x12345678
As shown below, the
The
[ IF rguard ] packbytes rsrc1 rsrc2
if rguard then {
}
rsrc1
packbytes
31
rdest<7:0>
rdest<15:8>
Initial Values
23
rsrc2<7:0>
rsrc1<7:0>
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
packbytes
15
rdest
31
0
0
operation packs the two least-significant bytes from the arguments rsrc1 and
0
7
0
0
0
packbytes r30 r40
IF r10 packbytes r40 r30
IF r20 packbytes r40 r30
0
0
23
0
0
0
0
0
0
rdest
0
0
0
15
Operation
rsrc2
31
7
r50
Pack least-significant byte
23
0
r60
r70
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
pack16lsb pack16msb
r50
no change, since guard is false
r70
mergelsb mergemsb
Philips Semiconductors
15
ATTRIBUTES
0x000078dd
0x0000dd78
SEE ALSO
Result
7
1, 2, 3, 4, 5
alu
No
52
—
0
2
1