tm1300 NXP Semiconductors, tm1300 Datasheet - Page 446

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

TM1300 Data Book
sex8
SYNTAX
FUNCTION
DESCRIPTION
argument and r0 (always contains 0) as the second. (Note: pseudo operations cannot be used in assembly source
files.)
and 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
A-160
r30 = 0xffff0040
r10 = 0, r40 = 0xff0fff91
r20 = 1, r40 = 0xff0fff91
r50 = 0x00000091
The
As shown below, the
The
[ IF r guard ] sex8 r src1
if r guard then
r dest
sex8
sex8
Initial Values
sign_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
sex8
PRODUCT SPECIFICATION
operation sign extends the least-significant halfword of the argument, r src1 , to 32 bits
r src1
r dest
sex8 r30
IF r10 sex8 r40
IF r20 sex8 r40
sex8 r50
S
3
3
S
S
r dest
S
S
S
S
S
S
2
2
S
S
S
r60
r110
Operation
S
S
S
S
S
1
1
S
r70
r100
S
S
S
S
S
S
S
S
7
7
signed
signed
r60
no change, since guard is false
r100
r110
0
0
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ibytesel sex16 zex8 zex16
ibytesel
0x00000040
0xffffff91
0xffffff91
Philips Semiconductors
Sign extend 8 bits
pseudo-op for ibytesel
ATTRIBUTES
SEE ALSO
Result
with r src1 as the first
1, 2, 3, 4, 5
alu
No
56
—
1
1