Xerox 560 Reference Manual

MI MULTIPLY IMMEDIATE
(Immediate
operand)
The value field (bit positions 12-31 of the instruction word)
is
treated as a 20-bit, twols complement integer. MULTIPLY
IMMEDIATE
extends the sign of the value field (bit posi-
tion 12) of the instruction word 12 bit positions to the left
and multiplies the resulting 32-bit value by the contents
of register Ru1, then loads the 32 high-order bits of the
product into register R, and then loads the 32 low-order
bits of the product into regi ster Ru 1.
If R is
an odd value, the result in register R is the 32 low-
order bits of the product. Thus, in order to generate a
64-bit product, the R field of the instruction must be even
and the multiplicand must be in register R+1. The condi-
tion code settings are based on the 64-bit product formed
during instruction
execution, rather than on the final con-
tents of register R. Overflow cannot occur.
Affected: (R), (Rul), CC2,
CC3,CC4
(Rul) x (I)12-31SE -R,Ru1
Condition code settings:
2 3 4
64-bi t product
- - 0 0 Zero.
" ~ 1 _ ___ .L-. __
- V I"'C~UIIVC.
o Positive
Trap:
Nonexistent instruc-
tion if bit 0 is a 1.
o Result is correct, as represented in regis-
ter Ru1.
Result is not correctly representable in reg-
ister Ru1 alone.
If MI is indirectly addressed, it is treated as a nonexistent
instruction, in which case the BP unconditionally aborts
execution of the instruction (at the time of operation code
decoding) and traps to location X
'
40
'
with the contents
of register R, register Ru1, and the condition code un-
changed; otherwise, the BP executes the next instruction
in
sequence.
Example 1, even R field value:
Before execution After execution
(1)12-31
X
'70000 I
XI 70000
1
(R)
xxxxxxxx
X
I 00007000 I
(Ru1 )
XI 10001000
1
X 170000000 I
CC
xxxx
x110
Example 2, odd R field value:
Before execution
After execution
(I) 12-31
X
'
01234
1
X
'
01234
1
(R)
X
'
00030002
1
XI 369C2468 I
CC xxxx
xOlO
MH MULTIPLY HALFWORD
(Halfword
index alignment)
H 57 I R I X I: Reference: address I
o 1 2 3 1 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19120 21 22 23 24 25 26 27128 29 30 31
MULTIPLY HALFWORD multiplies the contents of bit posi-
tions 16-31 of register R by the effective halfword (with
both halfwords
treated as signed, twols complement inte-
gers) and stores the product in register Ru 1 (overflow cannot
occur). If R is an even value, the original multiplier
in register R is preserved, allowing repetitive halfword
multiplication with a constant multiplier; however, if R is
an odd value, the product is loaded into the same register.
Overflow cannot occur.
Affected: (Rul), CC3, CC4
(R)16-31 x EH -Ru1
Condition code settings:
2 3 4
Result in
Ru 1
-
0 0 Zero
-
0 Negative
0
Positive
Example 1,
even R field value:
Before execution
EH X'FFFF'
(R)
XI xxxxOOOA I
(Rul)
xxxxxxxx
CC xxxx
Example
2, odd R field value:
Before execution
EH
X'FFFF
'
(R)
XI xxxxOOOA I
CC
xxxx
After execution
X'FFFF'
XI xxxxOOOA I
X
'
FFFFFFF6
1
xx01
After execution
X'FFFF'
X
'
FFFFFFF6
1
xx01
Fixed-Point Arithmetic Instructions 63

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