PNX1300 Philips, PNX1300 Datasheet - Page 433

• Manufacturer Part Number: PNX1300
• Description: Media Processors
• Manufacturer: Philips

PNX1300/01/02/11 Data Book
lsr
SYNTAX
FUNCTION
DESCRIPTION
amount, and rsrc1 is logically shifted right by this amount. If the rsrc2<31:5> value is not zero, then take this as a shift
by 32 or more bits. 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
A-135
r30 = 0x7008000f, r20 = 1
r30 = 0x7008000f, r42 = 2
r10 = 0, r30 = 0x7008000f, r44 = 4
r20 = 1, r30 = 0x7008000f, r44 = 4
r40 = 0x80030007, r44 = 4
r30 = 0x7008000f, r45 = 0x1f
r30 = 0x8008000f, r45 = 0x1f
r30 = 0x7008000f, r45 = 0x20
r30 = 0x8008000f, r45 = 0x80000000
r30 = 0x8008000f, r45 = 0x23
As shown below, the
The
[ IF rguard ] lsr rsrc1 rsrc2
if rguard then {
}
rsrc1
n
rdest<31:32–n>
rdest<31–n:0>
if rsrc2<31:5> != 0 {
}
rdest <- 0
S
lsr
31
rsrc2<4:0>
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
rsrc1<31:n>
0
Intermediate result
PRELIMINARY SPECIFICATION
(example: n = 3)
lsr
operation takes two arguments, rsrc1 and rsrc2. Rsrc2 specifies an unsigned shift
rdest
lsr r30 r20
lsr r30 r42
IF r10 lsr r30 r44
IF r20 lsr r30 r44
lsr r40 r44
lsr r30 r45
lsr r30 r45
lsr r30 r45
lsr r30 r45
lsr r30 r45
31
0
0
0
0
0
0
28
S
S
rdest
0
Operation
Right shifter
r50
r60
r90
r100
r100
r100
r100
r100
32 bits from rsrc1
rsrc2
r70
r80
31
r50
r60
no change, since guard is false
r80
r90
r100
r100
r100
r100
r100
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
0x00000000
0x00000000
0x00000000
Philips Semiconductors
Logical shift right
lsri rol roli
ATTRIBUTES
SEE ALSO
rsrc2
Result
shifter
1, 2
No
96
—
0
2
1