PNX1300 Philips, PNX1300 Datasheet - Page 421

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

PNX1300/01/02/11 Data Book
isub
SYNTAX
FUNCTION
DESCRIPTION
either both signed or unsigned integers. No overflow or underflow detection is performed.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-123
r30 = 3, r40 = 4
r10 = 0, r60 = 0x100, r30 = 3
r20 = 1, r50 = 0x1000, r60 = 0x100
r70 = 0x80000000, r40 = 4
The
The
[ IF rguard ] isub rsrc1 rsrc2
if rguard then
rdest
isub
isub
Initial Values
rsrc1 – rsrc2
operation computes the difference rsrc1–rsrc2 and writes the result into rdest. The operands can be
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
isub r30 r40
IF r10 isub r60 r30
IF r20 isub r50 r60
isub r70 r40
rdest
Operation
r80
r100
r50
r90
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
no change, since guard is false
r90
r100
isubi borrow dspisub
Philips Semiconductors
0xffffffff
0xf00
dspidualsub fsub
0x7ffffffc
ATTRIBUTES
SEE ALSO
Result
Subtract
1, 2, 3, 4, 5
alu
No
13
—
2
1