PNX1300 Philips, PNX1300 Datasheet - Page 480

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

Philips Semiconductors
IEEE status flags from convert unsigned integer
to floating-point with rounding toward zero
SYNTAX
FUNCTION
DESCRIPTION
integer in rsrc1 to a single-precision IEEE floating-point value, 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 performed toward zero;
the IEEE rounding mode bits in PCSW are ignored.
controls the modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not
changed.
EXAMPLES
r30 = 3
r40 = 0xffffffff (4294967295)
r10 = 0, r50 = 0xfffffffd
r20 = 1, r50 = 0xfffffffd
r60 = 0x7fffffff (2147483647)
r70 = 0x80000000 (2147483648)
r80 = 0x7ffffff1 (2147483633)
The
The
[ IF rguard ] ufloatrzflags rsrc1
if rguard then
rdest
ufloatrzflags
ufloatrzflags
31
0
Initial Values
ieee_flags((float) ((unsigned long)rsrc1))
operation computes the IEEE exceptions that would result from converting the unsigned
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB
ufloatrzflags r30
ufloatrzflags r40
IF r10 ufloatrzflags r50
IF r20 ufloatrzflags r50
ufloatrzflags r60
ufloatrzflags r70
ufloatrzflags r80
rdest
Operation
PRELIMINARY SPECIFICATION
7
0
r100
r105
r117
r120
r122
OFZ
6
PNX1300/01/02/11 DSPCPU Operations
IFZ
5
r110
r115
INV
4
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ufloatflags ifloatrzflags
r100
r105
no change, since guard is false
r115
r117
r120
r122
OVF
ufloatrz ifloatflags
3
0
0x02 (INX)
0x02 (INX)
0x02 (INX)
0
0x02 (INX)
ufloatrzflags
UNF
ATTRIBUTES
2
SEE ALSO
Result
INX
1
DBZ
0
120
1, 4
falu
No
—
1
3
A-182