PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 386

• Manufacturer Part Number: PNX1301
• Description: Media Processors
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
IEEE status flags from convert floating-point to
integer using PCSW rounding mode
SYNTAX
FUNCTION
DESCRIPTION
precision IEEE floating-point value in rsrc1 to a signed integer, and an integer bit vector representing the computed
exception flags is written into rdest. The bit vector stored in rdest 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 rsrc1 is denormalized, zero is substituted before computing the conversion, and the
IFZ bit in the result is set.
controls the modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest 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 rguard ] ifixieeeflags rsrc1
if rguard then
rdest
ifixieeeflags
ifixieeeflags
31
0
Initial Values
ieee_flags((long) ((float)rsrc1))
operation computes the IEEE exceptions that would result from converting the single-
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB
ifixieeeflags r30
ifixieeeflags r35
IF r10 ifixieeeflags r40
IF r20 ifixieeeflags r40
ifixieeeflags r45
ifixieeeflags r50
ifixieeeflags r60
ifixieeeflags r70
ifixieeeflags r80
rdest
Operation
PRELIMINARY SPECIFICATION
7
0
r100
r102
r112
r115
r117
r120
r122
OFZ
6
PNX1300/01/02/11 DSPCPU Operations
IFZ
5
r105
r110
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
122
1, 4
falu
No
—
1
3
A-88