
Philips Semiconductors
DSPCPU Operations for TM1300
PRODUCT SPECIFICATION
A-177
IEEE status ags from convert oating-point to
unsigned integer with round toward zero
SYNTAX
[ IF r
guard ] ufixrzflags rsrc1
→ rdest
FUNCTION
if r
guard then
r
dest
← ieee_ags((unsigned long) ((oat)rsrc1))
ATTRIBUTES
Function unit
falu
Operation code
126
Number of operands
1
Modier
No
Modier range
—
Latency
3
Issue slots
1, 4
DESCRIPTION
The ufixrzflags operation computes the IEEE exceptions that would result from converting the single-precision
IEEE oating-point value in r
src1 to an unsigned integer, and an integer bit vector representing the computed
exception ags is written into r
dest. The bit vector stored in rdest has the same format as the IEEE exception bits in
the PCSW. The exception ags 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 ufixrzflags operation optionally takes a guard, specied in r
guard. If a guard is present, its LSB controls the
modication of the destination register. If the LSB of r
guard is 1, rdest is written; otherwise, rdest is not changed.
EXAMPLES
Initial Values
Operation
Result
r30 = 0x40400000 (3.0)
ufixrzflags r30
→ r100
r100
← 0
r35 = 0x40247ae1 (2.57)
ufixrzflags r35
→ r102
r102
← 0x02 (INX)
r10 = 0,
r40 = 0xff4fffff (–3.402823466e+38)
IF r10 ufixrzflags r40
→ r105
no change, since guard is false
r20 = 1,
r40 = 0xff4fffff (–3.402823466e+38)
IF r20 ufixrzflags r40
→ r110
r110
← 0x10 (INV)
r45 = 0x7f800000 (+INF))
ufixrzflags r45
→ r112
r112
← 0x10 (INV)
r50 = 0xbfc147ae (-1.51)
ufixrzflags r50
→ r115
r115
← 0x10 (INV)
r60 = 0x00400000 (5.877471754e-39)
ufixrzflags r60
→ r117
r117
← 0x20 (IFZ)
r70 = 0xffffffff (QNaN)
ufixrzflags r70
→ r120
r120
← 0x10 (INV)
r80 = 0xffbfffff (SNaN)
ufixrzflags r80
→ r122
r122
← 0x10 (INV)
OFZ
IFZ
INV
OVF
UNF
INX
DBZ
0
1
2
3
4
5
6
7
31
00
SEE ALSO
ufixrz ifixrzflags
ifixieeeflags
ufixieeeflags
ufixrzflags