tm1300 NXP Semiconductors, tm1300 Datasheet - Page 487

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

Philips Semiconductors
Unsigned multiply
SYNTAX
FUNCTION
DESCRIPTION
full 64-bit product into r dest . The operands are considered unsigned integers. No overflow or underflow detection is
performed.
modification of the destination register. If the LSB of r guard is 1, r dest is written; otherwise, r dest is not changed.
EXAMPLES
r60 = 0x100
r10 = 0, r60 = 0x100, r30 = 0xf11
r20 = 1, r60 = 0x100, r30 = 0xf11
r70 = 0x100, r40 = 0xffffff9c
As shown below, the
The
[ IF r guard ] umul r src1 r src2
if r guard then
r src1
temp
r dest
64-bit result
umul
3
Initial Values
zero_ext32to64(r src1 )
temp<31:0>
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
6
umul
unsigned
operation computes the product r src1 r src2 and writes the least-significant 32 bits of the
r dest
zero_ext32to64(r src2 )
umul r60 r60
IF r10 umul r60 r30
IF r20 umul r60 r30
umul r70 r40
3
r dest
0
Operation
unsigned
unsigned
r80
r100
3
PRODUCT SPECIFICATION
r src2
3
r50
r90
DSPCPU Operations for TM1300
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r90
r100
imul imulm umulm dspimul
unsigned
dspumul dspidualmul
0x10000
0xf1100
quadumulmsb fmul
0xffff9c00
ATTRIBUTES
SEE ALSO
Result
0
umul
ifmul
138
2, 3
No
—
0
2
3
A-201