4.10 Stack Manipulation

Remove N procedure arguments from the stack:

SP := SP + N*BPW

and then push the content of RR on the stack.

Push the current top of the stack (S0), thereby duplicating it.

Pop the top element S0 and load it into the return register RR.

Move the stack pointer SP by N machine words:

SP := SP - N*BPW.

Moving the stack pointer `down' (N>=1) allocates space on the stack, moving it `up' (N<=-1) deallocates space. STACK is primarily used to allocate and release dynamic memory in procedures.

Exchange the values of S0 and S1.