PNX1300 Philips, PNX1300 Datasheet - Page 476

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

Philips Semiconductors
IEEE status flags from convert floating-point to
unsigned integer with round toward zero
SYNTAX
FUNCTION
DESCRIPTION
IEEE floating-point value in rsrc1 to an unsigned 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 toward zero is performed;
the IEEE rounding mode bits in PCSW are ignored. If an argument 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 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 ] ufixrzflags rsrc1
if rguard then
rdest
ufixrzflags
ufixrzflags
31
0
Initial Values
ieee_flags((unsigned long) ((float)rsrc1))
operation computes the IEEE exceptions that would result from converting the single-precision
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls
ufixrzflags r30
ufixrzflags r35
IF r10 ufixrzflags r40
IF r20 ufixrzflags r40
ufixrzflags r45
ufixrzflags r50
ufixrzflags r60
ufixrzflags r70
ufixrzflags r80
rdest
Operation
PRELIMINARY SPECIFICATION
7
0
r100
r102
r112
r115
r117
r120
r122
OFZ
6
PNX1300/01/02/11 DSPCPU Operations
r105
r110
IFZ
5
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
OVF
3
ufixrz ifixrzflags
0
0x02 (INX)
0x10 (INV)
0x10 (INV)
0x10 (INV)
0x20 (IFZ)
0x10 (INV)
0x10 (INV)
ifixieeeflags
ufixieeeflags
UNF
ATTRIBUTES
2
SEE ALSO
ufixrzflags
Result
INX
1
DBZ
0
126
1, 4
falu
No
—
1
3
A-178