CSE 30 -- Lecture 3 -- Oct 7
Topics covered in class
Reading assignment: chapter 3 of Kane & Heinrich.
- Homework 1 clarifications:
- it is okay to either specify non-instruction memory
contents via notation like mem=1 or via MIPS
assembler-like directives. See lecture 2 notes
for an example. You can assume that data placed in memory via a
.data directive or instructions placed in memory via a
.text directive will not coincide with the input values
x and y in memory locations 0 and 1 respectively,
nor with memory address 2 (this is where the output goes). You may
use symbolic names for these instead too, as long as you comment your
code to this effect.
- efficiency for this assignment does not matter -- how
fast your code runs will matter in future assignments, but not for
this one. If you look carefully,
the example in the
lecture 2 notes has a couple of instructions that can be omitted.
The goal of the One-Instruction Computer is to learn how to make
longer, more complex code sequences out of simple instructions, learn
basic assembler syntax, talk about macro assemblers, and learn that
there is a universal instruction set (much like NAND
is universal for circuits), not to actually use it as a real
- One-instruction computer: how to do subroutine
call/return with self-modifying code.
- Why self-modifying code (on a real
machine) is a bad idea in real computers.
- Isn't the OIC the RISC idea taken to an
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