General Computer Science 320201 GenCS I & II Lecture ... - Kwarc

we subtract
[proc 2 26,
con 0, arg 2, leq, cjp 5,
con 1, return,
con 1, arg 2, sub, arg 1,
call 0, arg 1, mul,
return,
con 2, con 10, call 0,
halt]
10
1
32 0
10 -1
2 -2
then we push the second argument (from the call frame position −1)
[proc 2 26,
con 0, arg 2, leq, cjp 5,
con 1, return,
con 1, arg 2, sub, arg 1,
call 0, arg 1, mul,
return,
con 2, con 10, call 0,
halt]
call jumps to the first body instruction,
22 0
10 -1
1 -2
32
10
2
and pushes the return address (22 this time) onto the stack.
[proc 2 26,
con 0, arg 2, leq, cjp 5,
con 1, return,
con 1, arg 2, sub, arg 1,
call 0, arg 1, mul,
return,
con 2, con 10, call 0,
halt]
we augment the stack
[proc 2 26,
con 0, arg 2, leq, cjp 5,
con 1, return,
con 1, arg 2, sub, arg 1,
call 0, arg 1, mul,
return,
con 2, con 10, call 0,
halt]
1
0
22 0
10 -1
1 -2
32
10
2
22 0
10 -1
1 -2
32
10
2
we compare the top two, and jump ahead (on false)
173