PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 323
PNX1301
Manufacturer Part Number
PNX1301
Description
Media Processors
Manufacturer
PHILIPS [NXP Semiconductors]
Datasheet
1.PNX1301.pdf
(548 pages)
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dspidualabs
SYNTAX
FUNCTION
DESCRIPTION
a constant zero as first argument and the
cannot be used in assembly source files.)
high and low 16-bit halfwords of rsrc1. Both absolute values are clipped into the range [0x0..0x7fff] and written into the
corresponding halfwords of rdest. All values are signed 16-bit integers.
the modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-25
r30 = 0xffff0032
r10 = 0, r40 = 0x80008001
r20 = 1, r40 = 0x80008001
r50 = 0x0032ffff
r90 = 0x7fffffff
The
The
The
[ IF rguard ] dspidualabs rsrc1
if rguard then {
}
temp1
temp2
if temp1 = 0xffff8000 then temp1
if temp2 = 0xffff8000 then temp2
if temp1 < 0 then temp1
if temp2 < 0 then temp2
rdest<31:16>
rdest<15:0>
dspidualabs
dspidualabs
dspidualabs
Initial Values
sign_ext16to32(rsrc1<15:0>)
sign_ext16to32(rsrc1<31:16>)
temp1<15:0>
temp2<15:0>
PRELIMINARY SPECIFICATION
operation is a pseudo operation transformed by the scheduler into an h_
operation performs two 16-bit clipped, signed absolute value computations separately on the
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls
–temp1
–temp2
dspidualabs r30
IF r10 dspidualabs r40
IF r20 dspidualabs r40
dspidualabs r50
dspidualabs r90
0x7fff
0x7fff
dspidualabs
Dual clipped absolute value of signed 16-bit
rdest
Operation
argument as second argument. (Note: pseudo operations
r60
r80
r110
r70
r100
pseudo-op for h_dspidualabs
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60
no change, since guard is false
r100
r80
r110
dspidualadd dspidualmul
h_dspidualabs dspiabs
Philips Semiconductors
0x00010032
0x00320001
0x7fff7fff
0x7fff0001
dspidualsub
ATTRIBUTES
SEE ALSO
dspidualabs
Result
halfwords
dspalu
1, 3
No
72
—
1
2
with
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