tm1300 NXP Semiconductors, tm1300 Datasheet - Page 437

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

Philips Semiconductors
Unsigned quad 8-bit multiply most significant
SYNTAX
FUNCTION
DESCRIPTION
8-bit bytes of r src1 and r src2 . All bytes are considered unsigned. The most-significant 8 bits of each 16-bit product is
written to the corresponding byte in 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
r30 = 0x0210800e, r40 = 0xffffff02
r10 = 0, r60 = 0x80ff1010, r70 = 0x80ff100f
r20 = 1, r60 = 0x80ff1010, r70 = 0x80ff100f
As shown below, the
The
Four full-precision
[ IF r guard ] quadumulmsb r src1 r src2
if r guard then {
}
r src1
16-bit products
temp
r dest <7:0>
temp
r dest <15:8>
temp
r dest <23:16>
temp
r dest <31:24>
quadumulmsb
3
unsigned
1
(zero_ext8to32(r src1 <7:0>)
(zero_ext8to32(r src1 <15:8>)
(zero_ext8to32(r src1 <23:16>)
(zero_ext8to32(r src1 <31:24>)
Initial Values
temp<15:8>
unsigned
temp<15:8>
2
temp<15:8>
temp<15:8>
unsigned
7
quadumulmsb
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
1
0
unsigned
r dest
1
3
zero_ext8to32(r src2 <7:0>))
unsigned
zero_ext8to32(r src2 <15:8>))
zero_ext8to32(r src2 <23:16>))
zero_ext8to32(r src2 <31:24>))
operation computes four separate products of the four pairs of corresponding
7
quadumulmsb r30 r40
IF r10 quadumulmsb r60 r70
IF r20 quadumulmsb r60 r70
unsigned
unsigned
7
2
unsigned
0
0
r dest
Operation
1
1
PRODUCT SPECIFICATION
unsigned
r src2
3
unsigned
unsigned
7
7
r50
unsigned
2
DSPCPU Operations for TM1300
unsigned
0
r80
r90
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
quadavg dspuquadaddui
quadumulmsb
1
r50
no change, since guard is false
r90
1
unsigned
ATTRIBUTES
0x010f7f00
0x40fe0100
SEE ALSO
unsigned
ifir8ii
7
Result
7
unsigned
dspmul
0
2, 3
No
89
—
0
2
3
A-151