PNX1300 Philips, PNX1300 Datasheet - Page 316
PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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Philips Semiconductors
Compute carry bit from unsigned add
SYNTAX
FUNCTION
DESCRIPTION
generates a carry (if the sum is greater than 2
to 0.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r70 = 2, r30 = 0xfffffffc
r10 = 0, r70 = 2, r30 = 0xfffffffc
r20 = 1, r70 = 2, r30 = 0xfffffffc
r60 = 4, r30 = 0xfffffffc
r30 = 0xfffffffc
The
The
[ IF rguard ] carry rsrc1 rsrc2
if rguard then {
}
if (rsrc1+rsrc2) < 2
else
carry
carry
rdest
rdest
Initial Values
0
1
operation computes the unsigned sum of the first and second arguments, rsrc1+rsrc2. If the sum
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
32
then
carry r70 r30
IF r10 carry r70 r30
IF r20 carry r70 r30
carry r60 r30
carry r30 r30
32
-1), 1 is stored in the destination register, rdest; otherwise, rdest is set
rdest
Operation
r80
r110
r120
PRELIMINARY SPECIFICATION
r90
r100
PNX1300/01/02/11 DSPCPU Operations
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r100
r110
r120
0
0
1
1
ATTRIBUTES
SEE ALSO
borrow
Result
1, 2, 3, 4, 5
carry
alu
No
45
—
2
1
A-18
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