tm1300 NXP Semiconductors, tm1300 Datasheet - Page 373
tm1300
Manufacturer Part Number
tm1300
Description
Tm-1300 Media Processor
Manufacturer
NXP Semiconductors
Datasheet
1.TM1300.pdf
(533 pages)
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Philips Semiconductors
IEEE status flags from convert floating-point to
integer using PCSW rounding mode
SYNTAX
FUNCTION
DESCRIPTION
precision IEEE floating-point value in r src1 to a signed integer, and an integer bit vector representing the computed
exception flags is written into r dest . The bit vector stored in r dest has the same format as the IEEE exception bits in
the PCSW. The exception flags in PCSW are left unchanged by this operation. Rounding is according to the IEEE
rounding mode bits in PCSW. If r src1 is denormalized, zero is substituted before computing the conversion, and the
IFZ bit in the result is set.
the 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 = 0x40400000 (3.0)
r35 = 0x40247ae1 (2.57)
r10 = 0,
r40 = 0xff4fffff (–3.402823466e+38)
r20 = 1,
r40 = 0xff4fffff (–3.402823466e+38)
r45 = 0x7f800000 (+INF))
r50 = 0xbfc147ae (-1.51)
r60 = 0x00400000 (5.877471754e-39)
r70 = 0xffffffff (QNaN)
r80 = 0xffbfffff (SNaN)
The
The
[ IF r guard ] ifixieeeflags r src1
if r guard then
r dest
ifixieeeflags
ifixieeeflags
31
0
Initial Values
ieee_flags((long) ((float)r src1 ))
operation optionally takes a guard, specified in r guard . If a guard is present, its LSB controls
operation computes the IEEE exceptions that would result from converting the single-
ifixieeeflags r30
ifixieeeflags r35
IF r10 ifixieeeflags r40
IF r20 ifixieeeflags r40
ifixieeeflags r45
ifixieeeflags r50
ifixieeeflags r60
ifixieeeflags r70
ifixieeeflags r80
r dest
Operation
PRODUCT SPECIFICATION
7
0
r100
r102
r112
r115
r117
r120
r122
OFZ
6
IFZ
5
r105
r110
DSPCPU Operations for TM1300
INV
4
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r100
r102
no change, since guard is false
r110
r112
r115
r117
r120
r122
ifixrzflags ufixrzflags
ifixieee ufixieeeflags
OVF
3
0
0x02 (INX)
0x10 (INV)
0x10 (INV)
0x02 (INX)
0x20 (IFZ)
0x10 (INV)
0x10 (INV)
UNF
ifixieeeflags
ATTRIBUTES
2
SEE ALSO
Result
INX
1
DBZ
0
falu
122
1, 4
No
—
1
3
A-87
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