tm1300 NXP Semiconductors, tm1300 Datasheet - Page 317

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

Philips Semiconductors
Clipped unsigned multiply
SYNTAX
OPERATION
DESCRIPTION
range [2
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 = 0x10, r40 = 0x20
r10 = 0, r30 = 0x10, r40 = 0x20
r20 = 1, r30 = 0x10, r40 = 0x20
r50 = 0x40000000, r90 = 2
r80 = 0xffffffff
r70 = 0x80000000, r90 = 2
As shown below, the
The
[ IF r guard ] dspumul r src1 r src2
if r guard then {
}
r src1
Full-precision
64-bit result
temp
if (unsigned)temp > 0x00000000ffffffff then
else
dspumul
r dest
r dest
3
32
–1..0] (or [0xffffffff..0]), and stores the clipped value into r dest .
Initial Values
zero_ext32to64(r src1 )
6
0xffffffff
temp<31:0>
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
dspumul
unsigned
r dest
zero_ext32to64(r src2 )
operation computes unsigned product r src1 r src2 , clips the result into the unsigned
dspumul r30 r40
IF r10 dspumul r30 r40
IF r20 dspumul r30 r40
dspumul r50 r90
dspumul r80 r80
dspumul r70 r90
3
0
r dest
Clip to [2
Operation
unsigned
unsigned
32
–1..0]
PRODUCT SPECIFICATION
r src2
r60
r110
r120
r120
3
r80
r100
DSPCPU Operations for TM1300
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60
no change, since guard is false
r100
r110
r120
r120
dspiabs dspiadd dspisub
dspuadd dspumul dspusub
unsigned
0x200
0x200
0x80000000
0xffffffff
0xffffffff
ATTRIBUTES
SEE ALSO
Result
dspumul
0
ifmul
142
2, 3
No
—
0
2
3
A-31