PNX1300 Philips, PNX1300 Datasheet - Page 343
PNX1300
Manufacturer Part Number
PNX1300
Description
Media Processors
Manufacturer
Philips
Datasheet
1.PNX1300.pdf
(548 pages)
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PNX1300/01/02/11 Data Book
feqlflags
SYNTAX
FUNCTION
DESCRIPTION
rsrc1=rsrc2 and stores a bit vector representing the exception flags into rdest. The argument values are in IEEE
single-precision floating-point format; the result is an integer bit vector. 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. If
an argument is denormalized, zero is substituted before computing the comparison, and the IFZ bit in the result is set.
modification of the destination register. If the LSB of rguard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
A-45
r30 = 0x40400000 (3.0), r40 = 0 (0.0)
r30 = 0x40400000 (3.0)
r10 = 0, r60 = 0x3f800000 (1.0),
r30 = 0x40400000 (3.0)
r20 = 1, r60 = 0x3f800000 (1.0),
r30 = 0x40400000 (3.0)
r30 = 0x40400000 (3.0),
r60 = 0x3f800000 (1.0)
r30 = 0x40400000 (3.0),
r61 = 0xffffffff (QNaN)
r50 = 0x7f800000 (+INF)
r55 = 0xff800000 (-INF)
r60 = 0x3f800000 (1.0),
r65 = 0x00400000 (5.877471754e-39)
r50 = 0x7f800000 (+INF)
The
The
[ IF rguard ] feqlflags rsrc1 rsrc2
if rguard then
rdest
feqlflags
feqlflags
31
0
ieee_flags((float)rsrc1 = (float)rsrc2)
Initial Values
operation optionally takes a guard, specified in rguard. If a guard is present, its LSB controls the
operation computes the IEEE exceptions that would result from computing the comparison
PRELIMINARY SPECIFICATION
feqlflags r30 r40
feqlflags r30 r30
IF r10 feqlflags r60 r30
IF r20 feqlflags r60 r30
feqlflags r30 r60
feqlflags r30 r61
feqlflags r50 r55
feqlflags r60 r65
feqlflags r50 r50
IEEE status flags from floating-point compare
rdest
Operation
7
0
OFZ
r80
r90
r120
r121
r125
r126
r127
6
IFZ
5
r100
r110
INV
4
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r80
r90
no change, since guard is false
r110
r120
r121
r125
r126
r127
OVF
3
feql ieql fgtrflags
Philips Semiconductors
0
0
0
0
0
0
0x20 (IFZ)
0
UNF
ATTRIBUTES
2
SEE ALSO
readpcsw
Result
INX
1
DBZ
0
fcomp
equal
149
No
—
2
1
3
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