PNX1300 Philips, PNX1300 Datasheet - Page 339

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

PNX1300/01/02/11 Data Book
faddflags
SYNTAX
FUNCTION
DESCRIPTION
and stores a bit vector representing the exception flags into r dest. The argument values are in IEEE single-precision
floating-point format; the result is an integer bit vector. The bit vector stored in r dest 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 according
to the IEEE rounding mode bits in PCSW. If an argument is denormalized, zero is substituted before computing the
sum, and the IFZ bit in the result is set. If the sum would be denormalized, the OFZ 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-41
r10 = 0x7f7fffff (3.402823466e+38),
r20 = 0x3f800000 (1.0)
r30 = 0,
r10 = 0x7f7fffff (3.402823466e+38)
r40 = 1,
r10 = 0x7f7fffff (3.402823466e+38)
r80 = 0x00a00000 (1.469367939e–38),
r81 = 0x80800000 (–1.17549435e–38)
r95 = 0x7f800000 (+INF),
r96 = 0xff800000 (–INF)
r98 = 0x40400000 (3.0),
r99 = 0x00400000 (5.877471754e–39)
The
The
[ IF rguard ] faddflags rsrc1 rsrc2
if rguard then
faddflags
faddflags
rdest
31
0
Initial Values
ieee_flags((float)rsrc1 + (float)rsrc2)
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 sum rsrc1+rsrc2
PRELIMINARY SPECIFICATION
faddflags r10 r20
IF r30 faddflags r10 r10
IF r40 faddflags r10 r10
faddflags r80 r81
faddflags r95 r96
faddflags r98 r99
IEEE status flags from floating-point add
rdest
Operation
7
0
OFZ
r60
r100
r105
r111
6
IFZ
5
r50
r70
INV
4
Function unit
Operation code
Number of operands
Modifier
Modifier range
Latency
Issue slots
r60
no change, since guard is false
r70
r100
r105
r111
fadd fsubflags readpcsw
OVF
3
Philips Semiconductors
0x2 (INX)
0xa (OVF INX)
0x46 (OFZ UNF INX)
0x10 (INV)
0x20 (IFZ)
UNF
ATTRIBUTES
2
SEE ALSO
Result
INX
1
DBZ
0
falu
112
1, 4
No
—
2
3