Xerox 550 User Manual

SH SUBTRACT HALFWORD
(Halfword
index alignment)
SUBTRACT HALFWORD extends the sign of the effective
halfword 16 bit positions to the left (to form a 32-bit word
in which
bit positions 0-15 contain the sign of the effec-
tive halfword), forms the two's cQmplement of the resulting
word, adds
the complemented word to the contents of reg-
ister R, and loads the sum into register R.
Affected: (R), CC
Trap: Fixed-point overflow
-EH
+ (R)-R
SE
Condition code settings:
2 3 4
Resu It in R
o 0 Zero
- -
0 Negative
o Positive
-
0 No fixed-point overflow
Fixed-point overflow
o -
No carry from bit position 0
- Carry from bit position 0
If CC2 is set to 1 and the fixed-point arithmetic trap mask
(AM) is a 1, the BP traps to location X'43' after loading
the sum into register R; otherwise, the BP executes the
next instruction in sequence.
SW SUBTRACT WORD
(Word index alignment)
o 1 314567891011121314151617181912021222324252627128293031
SUBTRACT WORD forms the two's complement of the effec-
tive word, adds that complement to the contents of regis-
ter R, and loads the sum into register R.
Affected: (R), CC Trap: Fixed-point overflow
-EW
+ (R)-R
Condition code settings:
2 3 4
Resu It in R
o 0 Zero
o Negative
2 3 4 Result in R
o Positive
-
0 - - No fixed-point overflow
- -
Fixed-point overflow
o - - - No carry from bit position 0
Carry from bit position 0
If CC2 is set to 1 and the fixed-point arithmetic trap mask
(AM) is a 1, the BP traps to location X'43' after loading
the sum into register R; otherwise, the BP executes the
next instruction in sequence.
so
SUBTRACT DOUBLEWORD
(Doubleword index alignment)
'SUBTRACT DOUBLEWORD forms the 64-bit two's comple-
ment of the effective doubleword, adds the complemented
doubleword to
the contents of registers Rand Ru1 (treated
as a single, 64-bit register), loads the 32 low-order bits of
the sum into register Ru 1 and loads the 32 hi gh -order bits
of the sum into register R.
Affected: (R), (Rul), CC
-ED + (R, Ru1) - R, Ru1
Condition code settings:
2 3 4 Result in
R, Ru1
o 0 Zero
- - 0
Negative
o Positive
Trap:
Fixed-point overflow,
instruction exception
- 0
- No fixed-point overflow
Fixed-point overflow
o -
- No carry from bit position 0
- Carry from bit position 0
If CC2 is set to 1 and the fixed-point arithmetic trap mask
(AM) is a 1,
the BP traps to location X
'
43
1
after the re-
sult is loaded into registers Rand Ru1; otherwise, the BP
executes the next instruction in sequence.
The R field of the SD instruction must be an even value for
proper operation of the instruction; if the R field of SD is
an odd value, the instruction traps to location X'4D',
instruction exception trap; the contents in register R remain
unchanged.
Fixed-Point Arithmetic Instructions 61

Xerox 550 Specifications

General

Monthly Duty Cycle	Up to 300, 000 pages
Connectivity	Ethernet, USB
Print Speed (Color)	Up to 50 ppm
Duplex Printing	Standard
Printer Type	Laser
Supported Operating Systems	Windows, macOS, Linux
Paper Size	A4, Legal, Letter