PNX1300 Philips, PNX1300 Datasheet - Page 472

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

Philips Semiconductors
Unsigned sum of products of unsigned bytes
SYNTAX
FUNCTION
DESCRIPTION
bytes of rsrc1 and rsrc2; the four products are summed, and the result is written to rdest. All values are considered
unsigned. All computations are performed without loss of precision.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r70 = 0x0afb14f6, r30 = 0x0a0a1414
r10 = 0, r70 = 0x0afb14f6, r30 = 0x0a0a1414
r20 = 1, r80 = 0x649c649c, r40 = 0x9c649c64
r50 = 0x80808080, r60 = 0xffffffff
As shown below, the
The
[ IF rguard ] ufir8uu rsrc1 rsrc2
if rguard then
rsrc1
rdest
ufir8uu
31
unsigned
zero_ext8to32(rsrc1<31:24>)
zero_ext8to32(rsrc1<23:16>)
zero_ext8to32(rsrc1<15:8>)
zero_ext8to32(rsrc1<7:0>)
Initial Values
23
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
unsigned
ufir8uu
15
unsigned
rdest
operation computes four separate products of the four pairs of corresponding 8-bit
31
zero_ext8to32(rsrc2<7:0>)
zero_ext8to32(rsrc2<31:24>) +
zero_ext8to32(rsrc2<15:8>) +
7
zero_ext8to32(rsrc2<23:16>) +
unsigned
ufir8uu r70 r30
IF r10 ufir8uu r70 r30
IF r20 ufir8uu r80 r40
ufir8uu r50 r60
0
rdest
unsigned
Operation
PRELIMINARY SPECIFICATION
rsrc2
31
unsigned
r90
r120
PNX1300/01/02/11 DSPCPU Operations
23
r100
r110
unsigned
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ifir8ui ifir8ii ifir16
r90
no change, since guard is false
r110
r120
15
unsigned
ATTRIBUTES
0x1efa
SEE ALSO
0xf3c0
0x1fe00
ufir16
Result
7
ufir8uu
unsigned
dspmul
2, 3
No
90
—
0
2
3
A-174