PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 332

• Manufacturer Part Number: PNX1301
• Description: Media Processors
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Clipped unsigned subtract
SYNTAX
FUNCTION
DESCRIPTION
unsigned 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 = 0, r90 = 1
r70 = 0x80000001, r80 = 0xffffffff
As shown below, the
The
[ IF rguard ] dspusub rsrc1 rsrc2
if rguard then {
}
rsrc1
temp
if (signed)temp < 0 then
else
dspusub
31
rdest
rdest
Initial Values
zero_ext32to64(rsrc1) – zero_ext32to64(rsrc2)
0
temp<31:0>
32
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
–1..0] (or [0xffffffff..0]), and stores the clipped value into rdest.
dspusub
Full-precision
unsigned
33-bit result
rdest
32
dspusub r30 r40
IF r10 dspusub r30 r40
IF r20 dspusub r30 r40
dspusub r50 r90
dspusub r70 r80
31
operation computes unsigned difference rsrc1–rsrc2, clips the result into the
0
rdest
Clip to [2
Operation
unsigned
signed
32
–1..0]
PRELIMINARY SPECIFICATION
rsrc2
r60
r110
r120
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 dspiadd dspimul
dspisub dspuadd dspumul
unsigned
0x1101
0x1101
0
0
ATTRIBUTES
SEE ALSO
Result
dspusub
dspalu
1, 3
No
69
—
0
2
2
A-34