Xerox 550 User Manual

Table 8. Condition Code Settings for Floating-Point Instructions
Condition Code
1 2
3
4
Meaning If No Trap to Location X'44'
Meaning If Trap to Location X'44' Occurs
0
0
0 0 A x 0,
a/A, or -A + A(f) with FN= I )
*@
0
0
0 1
N
< 0
Normal
*
resu Its
0
0
1 0 N >0
*
0
1
0
0
*@
Divide by zero )
0 1 0 1
*
Overflow,
N < 0 Always trapped
0
1 1 0
*
Overflow,
N >0
0
0
0
-A +A
FS=O
@[:
-A + A(f) )
0
0
1
N
< 0 > 2 P t I FN = 0, and
N < 0)
rs= I FN=O
os norma -
>
2 Postnormal- d' d '
}
0 0 h0ft no underflow
. . . an no un er-
a.
1
0
N>O IZlngs IS
N >0
IZlng shifts flow with FZ= 1
1 1 0
0
Underflow with FZ=O and no trap by FS= 10
*
1
1
0
1
*
1 1
1 0
*
Notes:
(j)
Result set to "true" zero
@
"*,, indicates impossible configurations
®
Applies to add and subtract only where FN = 0
The R field of the FAL instruction must be an even value
for proper operation of the instruction; if the R field of FAl
is an odd value, the instruction traps to location X'4D',
instruction exception trap.
FSS
FLOATING SUBTRACT SHORT
rNord index alignment)
H 3ci R I X I: Referenc~ address I
0123145678 9 1011121314151617181912021222324252627128293031
The effective word and the contents of register R are loaded
into a set of internal registers.
FLOATING SUBTRACT SHORT forms the two's complement
of the effective word and then operates identically to
FLOATING ADD SH ORT (FAS), If no flo(lting-po!n
t
arithmetic fault occurs, the difference is loaded into reg-
ister R as a short-format floating-point number.
Affected: (R), CC
(R) - EW- R
Trap: Floating-point arith-
metic fault
78 Floating-Point Arithmetic Instructions
FSL
lC
o 1 2
Underflow,
N < a}
FZ= 1
Underflow,
N >0
FLOATING SUBTRACT LONG
(Doubleword index alignment)
I R I X II Reference
l
address I
718 10 11112 13 14 115116 17 18 1912021 22 23124 25 26 27128 29 30 31'
The effective doubleword and the contents of registers R
and Ru 1 are loaded into a set of internal registers.
FLOATING SUBTRACT LONG forms the two's comple-
ment of the effective doubleword and then operates iden-
tically to FLOATING ADD LONG (FAL). If no floating-
point arithmetic fault occurs, the difference is loaded into
registers Rand Ru 1 as a long-format floating-point number.
Affected: (R), (Ru 1), CC
(R, Rul) - ED -R, Ru1
Trap: Floating-point arith-
metic fault, instruc-
tion exception
The R field of the FSL instruction must be an even value for
proper operation of the instruction; if the R field of FSL is
an odd value, the instruction traps to location X'4D',
instruction exception trap.

Xerox 550 Specifications

General

Monthly Duty Cycle	Up to 300, 000 pages
Connectivity	Ethernet, USB
Print Speed (Color)	Up to 50 ppm
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Supported Operating Systems	Windows, macOS, Linux
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