PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 434

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

Philips Semiconductors
Logical shift right immediate
SYNTAX
FUNCTION
DESCRIPTION
result in rdest that is equal to rsrc1 logically shifted right by n bits. The value of n must be between 0 and 31, inclusive.
Zeros fill vacated bits from the left.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is unchanged.
EXAMPLES
r30 = 0x7008000f
r30 = 0x7008000f
r10 = 0, r30 = 0x7008000f
r20 = 1, r30 = 0x7008000f
r40 = 0x80030007
r30 = 0x7008000f
r40 = 0x80030007
As shown below, the
The
[ IF rguard ] lsri(n) rsrc1
if rguard then {
}
rdest<31:32–n>
rdest<31–n:0>
lsri
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
Intermediate result
rsrc1<31:n>
lsri
0
(example: n = 3)
operation takes a single argument in rsrc1 and an immediate modifier n and produces a
rsrc1
rdest
lsri(1) r30
lsri(2) r30
IF r10 lsri(4) r30
IF r20 lsri(4) r30
lsri(4) r40
lsri(31) r30
lsri(31) r40
31
31
S
0
0
0
0
0
0
28
S
S
rdest
Operation
Right shifter
r50
r60
r90
32 bits from rsrc1
r100
r110
PRELIMINARY SPECIFICATION
r70
r80
PNX1300/01/02/11 DSPCPU Operations
r50
r60
no change, since guard is false
r80
r90
r100
r110
0
0
asl asli asr asri lsl lsli
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
0x38040007
0x1c020003
0x07008000
0x08003000
0x00000000
0x00000001
Shift amount n
from operation modifier
lsr rol roli
ATTRIBUTES
SEE ALSO
Result
shifter
7 bits
0..31
1, 2
9
1
1
lsri
A-136