tm1300 NXP Semiconductors, tm1300 Datasheet - Page 495

• Manufacturer Part Number: tm1300
• Description: Tm-1300 Media Processor
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Zero extend 8 bits
pseudo-op for ubytesel
SYNTAX
FUNCTION
DESCRIPTION
0) as the first argument and r src1 as the second. (Note: pseudo operations cannot be used in assembly source files.)
writes the result in r dest .
modification of the destination register. If the LSB of r guard is 1, r dest is written; otherwise, r dest is not changed.
EXAMPLES
r30 = 0xffff0040
r10 = 0, r40 = 0xff0fff91
r20 = 1, r40 = 0xff0fff91
r50 = 0x00000091
The
As shown below, the
The
[ IF r guard ] zex8 r src1
if r guard then
r dest
zex8
zex8
Initial Values
zero_ext8to32(r src1 <7:0>)
operation is a pseudo operation transformed by the scheduler into a
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls the
zex8
operation zero extends the least-significant byte of the argument, r src1 , to 32 bits and
r src1
r dest
zex8 r30
IF r10 zex8 r40
IF r20 zex8 r40
zex8 r50
3
3
0
0
0
r dest
0
0
0
0
0
0
0
0
r60
r110
0
Operation
0
0
0
0
0
0
PRODUCT SPECIFICATION
r70
r100
0
0
0
0
0
0
7
7
unsigned
unsigned
DSPCPU Operations for TM1300
r60
no change, since guard is false
r100
r110
ubytesel
0
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ubytesel sex16 sex8 zex16
0x00000040
0x00000091
0x00000091
ATTRIBUTES
with r0 (always contains
SEE ALSO
Result
1, 2, 3, 4, 5
zex8
alu
No
55
—
1
1
A-209