Xerox 560 Reference Manual page 104

3. The space count (SPD33-47) is decremented by 1 and
the word count (SPD49-63) is incremented by 1.
4. The condition code is set to reflect the new status of
the space count.
Affected: (SPD), (TSA+1), CC Trap: Push-down stack limit
(SPD)15_31 + 1 - SPD 15 _ 31 t
(R) - (SPD
15
_
31
)t
(SPD)33_47- 1 -
SPD 33 _ 47
(SPD) 49-63 + 1 - SPD 49-63
Condi ti on code setti ngs:
2 3 4 Result of PSW
0 0 0 0 Space count is greater
}
than
O.
0 0 0 Space count is now
O.
0 0 0 Word count
=
2 15 _1
,
TW
=
1.
0 0 Space count
=
0,
TS
=
1.
0 Space count
=
0, word
count
=
0, TS
=
1.
0 Word count
=
2 15 _1 ,
space count
=
0,
TW
=
1, and TS
=
1.
PLW
PULL WORD
(Doubleword index alignment)
Instructi on
completed
Instruction
aborted
08
I
R
I
x
I
1
Reference address
I
o
1 2
3 14 5 718 9 10 llL2 13 14'15h6 17 18 19120 21 22 231242526 2712829 JO )
PULL WORD loads register R with the word currently at the
top of the push-down stack defined by the stack pointer
doubleword located at the effective doubleword address
of PLW. If the pull operation can be performed successfully,
the instruction operates as follows:
1. Register R is loaded with the contents of the loca-
tion pointed to by the current top-of-stack address
(SPD 1 5_31)t.
2. The current top-of-stack address is decremented by 1,
to point to the new top-of-stack location.
tFor real extended mode of addressing this is a 20-bit
field (12-31); for real and virtual addressing modes it is
a 17-bit field (15-31).
98 Push-Down Instructions (Non-Privileged)
3. The space count (SPD33-47) is incremented by 1 and
the word count (SPD49-63) is decremented by 1.
4. The condition code is set to reflect the status of the
new word count.
Affected: (SPD), (R), CC Trap: Push-down stack limit
(SPD)15_31- R; (SPD)15_31- 1 -
SPD
15
_ 31 t
{SPD)33_47 + 1 - SPD 33 _ 4
i
(SPD)49_63- 1 -SPD 49-63
Condition code settings:
2 3 4 Result of PLW
0 0 0 0 Word count is greater
than
O.
0 0 0 Word count is now O.
0 0 Word count
=
0, TW
=
1.
0 Space count
=
0,
word count
=
0, TW
=
1.
0 0 0
15
Space count
=
2 -1,
TS
=
1.
0 1
15
Space count
=
2 -1,
word count
=
0, TS
=
1,
and TW
=
1.
PSM
PUSH MULTIPLE
(Doubleword index alignment)
)
Instruction
completed
Instruction
aborted
PUSH MULTIPLE stores the contents of a sequential set of
general registers into the push-down stack defined by the
stack pointer doubleword located at the effective double-
word address of PSM. The condition code must contain
a count of the number of registers to be pushed into the
stack. (An initial value of 0000 for the condition code
specifics that ef! 16 genera! registers ere to be pushed
into the stack.) The registers are treated as a circular set
(with register 0 following register 15) and the first register
to be pushed into the stack is register R. The last register
to be pushed in to the stack is register R + CC -1, and the
contents of this register become the contents of the new
top-of-stack location.