tm1300 NXP Semiconductors, tm1300 Datasheet - Page 403
tm1300
Manufacturer Part Number
tm1300
Description
Tm-1300 Media Processor
Manufacturer
NXP Semiconductors
Datasheet
1.TM1300.pdf
(533 pages)
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Philips Semiconductors
Signed multiply, return most-significant 32 bits
SYNTAX
FUNCTION
DESCRIPTION
the full 64-bit product into r dest . The operands are considered signed integers.
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 = 0x10000
r10 = 0, r60 = 0x100, r30 = 0xf11
r20 = 1, r60 = 0x10001000,
r30 = 0xf1100000
r70 = 0xffffff00, r40 = 0x64
As shown below, the
The
[ IF r guard ] imulm r src1 r src2
if r guard then
r src1
temp
r dest
64-bit result
imulm
3
Initial Values
(sign_ext32to64(r src1 )
temp<63:32>
6
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
imulm
signed
operation computes the product r src1 r src2 and writes the most-significant 32 bits of
r dest
sign_ext32to64(r src2 ))
imulm r60 r60
IF r10 imulm r60 r30
IF r20 imulm r60 r30
imulm r70 r40
3
r dest
0
Operation
signed
signed
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
dspidualmul quadumulmsb
umulm dspimul dspumul
signed
0x00000001
0xff10ff11
0xffffffff
ATTRIBUTES
SEE ALSO
Result
fmul
0
imulm
ifmul
139
2, 3
No
—
0
2
3
A-117
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