PNX1300 Philips, PNX1300 Datasheet - Page 347

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

PNX1300/01/02/11 Data Book
fgtrflags
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-49
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 ] fgtrflags rsrc1 rsrc2
if rguard then
rdest
fgtrflags
fgtrflags
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
fgtrflags r30 r40
fgtrflags r30 r30
IF r10 fgtrflags r60 r30
IF r20 fgtrflags r60 r30
fgtrflags r30 r60
fgtrflags r30 r61
fgtrflags r50 r55
fgtrflags r60 r65
fgtrflags 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
fgtr igtr fgeqflags
Philips Semiconductors
0
0
0
0
0x10 (INV)
0
0x20 (IFZ)
0
UNF
ATTRIBUTES
2
SEE ALSO
readpcsw
Result
INX
1
DBZ
0
greater
fcomp
145
No
—
2
1
3