PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 383

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

PNX1300/01/02/11 Data Book
ifir8ii
SYNTAX
FUNCTION
DESCRIPTION
bytes of rsrc1 and rsrc2; the four products are summed, and the result is written to rdest. All values are considered
signed; thus, the intermediate products and the final sum of products are signed. 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
A-85
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 ] ifir8ii rsrc1 rsrc2
if rguard then
rsrc1
rdest
ifir8ii
31
signed
sign_ext8to32(rsrc1<31:24>)
sign_ext8to32(rsrc1<23:16>)
sign_ext8to32(rsrc1<15:8>)
sign_ext8to32(rsrc1<7:0>)
Initial Values
23
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
signed
PRELIMINARY SPECIFICATION
ifir8ii
15
rdest
signed
operation computes four separate products of the four pairs of corresponding 8-bit
31
sign_ext8to32(rsrc2<7:0>)
sign_ext8to32(rsrc2<31:24>) +
sign_ext8to32(rsrc2<15:8>) +
sign_ext8to32(rsrc2<23:16>) +
7
signed
ifir8ii r70 r30
IF r10 ifir8ii r70 r30
IF r20 ifir8ii r80 r40
ifir8ii r50 r60
0
rdest
Signed sum of products of signed bytes
signed
Operation
rsrc2
31
signed
r90
r120
23
r100
r110
signed
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ifir8ui ufir8uu ifir16
r90
no change, since guard is false
r110
r120
Philips Semiconductors
15
signed
ATTRIBUTES
0xfa
SEE ALSO
0xffff63c0
0x200
ufir16
Result
7
signed
dspmul
2, 3
No
92
—
0
2
3