PNX1301 PHILIPS [NXP Semiconductors], PNX1301 Datasheet - Page 477

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

PNX1300/01/02/11 Data Book
ufloat
SYNTAX
FUNCTION
DESCRIPTION
and writes the result into rdest. Rounding is according to the IEEE rounding mode bits in PCSW. If
an IEEE exception, such as inexact, the corresponding exception flags in the PCSW are set. The PCSW exception
flags are sticky: the flags can be set as a side-effect of any floating-point operation but can only be reset by an explicit
writepcsw
other floating-point compute operations update the PCSW at the same time, the net result in each exception flag is the
logical OR of all simultaneous updates ORed with the existing PCSW value for that exception flag.
modification of the destination register. If the LSB of r guard is 1, rdest and the exception flags in PCSW are written;
otherwise, rdest is not changed and the operation does not affect the exception flags in PCSW.
EXAMPLES
A-179
r30 = 3
r40 = 0xffffffff (4294967295)
r10 = 0, r50 = 0xfffffffd
r20 = 1, r50 = 0xfffffffd
r60 = 0x7fffffff (2147483647)
r70 = 0x80000000 (2147483648)
r80 = 0x7ffffff1 (2147483633)
The
The
The
[ IF rguard ] ufloat rsrc1
if rguard then {
}
rdest
ufloatflags
ufloat
ufloat
Initial Values
(float) ((unsigned long)rsrc1)
operation. The update of the PCSW exception flags occurs at the same time as r dest is written. If any
operation converts the unsigned integer value in rsrc1 to single-precision IEEE floating-point format
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
PRELIMINARY SPECIFICATION
operation computes the exception flags that would result from an individual
ufloat r30
ufloat r40
IF r10 ufloat r50
IF r20 ufloat r50
ufloat r60
ufloat r70
ufloat r80
rdest
Operation
Convert unsigned integer to floating-point
r100
r105
r117
r120
r122
r110
r115
r100
r105
no change, since guard is false
r115
r117
r120
r122
0x40400000 (3.0)
0x4f800000 (4.294967296e+9), INX flag set
0x4f800000 (4.294967296e+9), INX flag set
0x4f000000 (2.147483648e+9), INX flag set
0x4f000000 (2.147483648e+9)
0x4f000000 (2.147483648e+9), INX flag set
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
ifloat ifloatrz ufloatrz
ifixieee ufloatflags
Philips Semiconductors
Result
ATTRIBUTES
SEE ALSO
ufloat
ufloat
.
falu
127
1, 4
No
—
causes
1
3