PNX1300 Philips, PNX1300 Datasheet - Page 322
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PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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Philips Semiconductors
Clipped signed add
SYNTAX
FUNCTION
DESCRIPTION
range [2
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
r30 = 0x1200, r40 = 0xff
r10 = 0, r30 = 0x1200, r40 = 0xff
r20 = 1, r30 = 0x1200, r40 = 0xff
r50 = 0x7fffffff, r90 = 1
r70 = 0x80000000, r80 = 0xffffffff
As shown below, the
The
[ IF rguard ] dspiadd rsrc1 rsrc2
if rguard then {
}
rsrc1
temp
if temp < 0xffffffff80000000 then
else if temp > 0x000000007fffffff then
else
dspiadd
31
rdest
rdest
rdest
31
–1..–2
Initial Values
sign_ext32to64(rsrc1) + sign_ext32to64(rsrc2)
0x80000000
0x7fffffff
temp
31
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
] (or [0x7fffffff..0x80000000]), and stores the clipped value into rdest. All values are signed integers.
dspiadd
Full-precision
33-bit result
signed
rdest
operation computes the sum rsrc1+rsrc2, clips the result into the 32-bit signed
32
dspiadd r30 r40
IF r10 dspiadd r30 r40
IF r20 dspiadd r30 r40
dspiadd r50 r90
dspiadd r70 r80
31
0
Clip to [2
rdest
Operation
signed
signed
31
–1..–2
PRELIMINARY SPECIFICATION
rsrc2
r60
r110
r120
31
31
]
PNX1300/01/02/11 DSPCPU Operations
r80
r100
0
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60
no change, since guard is false
r100
r110
r120
dspiabs dspimul dspisub
dspuadd dspumul dspusub
signed
0x12ff
0x12ff
0x7fffffff
0x80000000
ATTRIBUTES
SEE ALSO
Result
dspiadd
dspalu
1, 3
No
66
—
0
2
2
A-24
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