PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 309

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

PNX1300/01/02/11 Data Book
asri
SYNTAX
FUNCTION
DESCRIPTION
result in rdest that is equal to rsrc1 arithmetically shifted right by n bits. The value of n must be between 0 and 31,
inclusive. The MSB (sign bit) of rsrc1 is replicated as needed to 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
A-11
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 ] asri(n) rsrc1
if rguard then {
}
asri
rdest<31:31–n>
rdest<30–n:0>
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
Intermediate result
rsrc1<31:n>
asri
PRELIMINARY SPECIFICATION
rsrc1<31>
(example: n = 3)
operation takes a single argument in rsrc1 and an immediate modifier n and produces a
rsrc1
rdest
asri(1) r30
asri(2) r30
IF r10 asri(4) r30
IF r20 asri(4) r30
asri(4) r40
asri(31) r30
asri(31) r40
31
31
S
S
S
S
S
S
S
28
S
S
rdest
Arithmetic shift right by immediate amount
Operation
Right shifter
r50
r60
r90
32 bits from rsrc1
r100
r110
r70
r80
0
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
asl asli asr lsl lsli lsr
r50
r60
no change, since guard is false
r80
r90
r100
r110
Shift amount n
from operation modifier
Philips Semiconductors
0x38040007
0x1c020003
0x07008000
0xf8003000
0x00000000
0xffffffff
lsri rol roli
ATTRIBUTES
SEE ALSO
Result
shifter
7 bits
0..31
1, 2
10
1
1