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STACK MANIPULATION
DEFINITIONS
These are abbreviated details from WORD LIST, page 356, grouped here for convenience.
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-ROT
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(
n1 n2 n3 - n3 n1 n2 )
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?DUP
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(
0 - 0 ) or
( n1 - n1 n1 )
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.S
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(
- )
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Non-destructive
display of stack.
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2>R
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(
n1 n2 - )
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Moves two
numbers from stack to return stack.
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2DROP
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(
n1 n2 - )
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2DUP
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(
n1 n2 - n1 n2 n1 n2 )
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2OVER
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(
d1 d2 - d1 d2 d1 )
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2R>
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(
- n1 n2 )
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Moves two
numbers from return stack to stack.
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2R@
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(
- n1 n2 )
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Copies two
numbers from return stack to stack.
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2ROT
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(
d1 d2 d3 - d2 d3 d1 )
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2SWAP
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(
n1 n2 n3 n4 - n3 n4 n1 n2)
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><
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(
n1 - n2 )
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n2 is n1 with
its bytes swapped.
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>R
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(
n - )
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Moves number
from stack to return stack.
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DEPTH
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(
- n )
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n=number of
items on the stack before DEPTH .
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DROP
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(
n - )
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DUP
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(
n - n n )
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I
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(
- n )
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n is a copy of
the current loop index.
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J
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(
- n )
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Copies the index
of outer of two nested DO loops to the stack.
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NIP
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(
n1 n2 - n2 )
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OVER
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(
n1 n2 - n1 n2 n1 )
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PICK
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(
N - n )
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Take the (N+1)th
item on the stack (not including N) and place it on top of the stack.
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R>
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(
- n )
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Moves number
from return stack to stack.
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R@
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(
- n )
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Copies number
from return stack to stack.
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ROLL
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(
n - )
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Copies (n+1)th
item on stack to the top.
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ROT
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(
n1 n2 n3 - n2 n3 n1 )
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RP!
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(
aa - )
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Set return stack
pointer to position aa.
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RP0
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(
- aa )
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User variable
containing the initial location of return stack.
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RP@
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( - aa )
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Address of the
uppermost byte of top item on the return stack before RP@ was executed.
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SP!
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(
aa - )
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Set stack
pointer to address aa.
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SP0
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(
- aa )
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User variable
containing the initial location of stack.
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SP@
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(
- aa )
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Address of the
uppermost byte of top item on the stack before SP@ was executed.
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SWAP
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(
n1 n2 - n2 n1 )
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TUCK
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(
n1 n2 - n2 n1 n2 )
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