tm1300 NXP Semiconductors, tm1300 Datasheet - Page 458

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

TM1300 Data Book
ufir16
SYNTAX
FUNCTION
DESCRIPTION
halfwords of r src1 and r src2 ; the two products are summed, and the result is written to r dest . All halfwords are
considered unsigned; thus, the intermediate products and the final sum of products are unsigned. All intermediate
computations are performed without loss of precision; the final sum of products is clipped into the range [0xffffffff..0]
before being written into r dest .
modification of the destination register. If the LSB of r guard is 1, r dest is written; otherwise, r dest is not changed.
EXAMPLES
A-172
r30 = 0x00020003, r40 = 0x00010002
r10 = 0, r60 = 0x80000064, r70 = 0x00648000
r20 = 1, r60 = 0x80000064, r70 = 0x00648000
r30 = 0x00020003, r70 = 0x00648000
As shown below, the
The
[ IF r guard ] ufir16 r src1 r src2
if r guard then
r src1
r dest
ufir16
3
zero_ext16to32(r src1 <31:16>)
zero_ext16to32(r src1 <15:0>)
unsigned
Initial Values
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
ufir16
Full-precision
33-bit result
PRODUCT SPECIFICATION
1
r dest
operation computes two separate products of the two pairs of corresponding 16-bit
3
3
unsigned
zero_ext16to32(r src2 <31:16>) +
zero_ext16to32(r src2 <15:0>)
Sum of products of unsigned 16-bit halfwords
ufir16 r30 r40
IF r10 ufir16 r60 r70
IF r20 ufir16 r60 r70
ufir16 r30 r70
r dest
0
Clip to [2
unsigned
unsigned
32
Operation
–1..0]
r src2
3
r50
r100
unsigned
r80
r90
0
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ifir16 ifir8ii ifir8ui
r50
no change, since guard is false
r90
r100
Philips Semiconductors
1
ATTRIBUTES
8
0x00640000
SEE ALSO
0x000180c8
ufir8uu
unsigned
Result
dspmul
2, 3
No
94
—
0
2
3