in the cpu datapath there are 32 general-purpose registers, which can be read to supply source operands for the alu or written with the alu result. and, finally, there are branches and jumps whose execution may change the program counter and hence the address of the next instruction to be executed. by using a high-level language we can move up one more level abstraction and describe the computation we want in terms of variables and mathematical operations rather than registers and alu functions. a program called the “assembler” reads a text file containing the assembly language program and produces an array of 32-bit words that can be used to initialize main memory. it reads arithmetic expressions and evaluates them to produce 8-bit values, which it then adds sequentially to the array of bytes which will eventually be loaded into the beta’s memory.
symbols make the code easier to understand, e.g., we can use n as the name for an initial value for some computation, in this case the value 12. so if later we want to change the initial value, we only have to change the definition of the symbol n rather than find all the 12’s in our program and change them. then we’ll use those symbols to help us understand which instruction operands are intended to be registers, e.g., by writing r1, and which operands are numeric values, e.g., by writing the number 1. when the assembler encounters a macro, it “expands” the macro, replacing it with a string of text provided by in the macro’s definition. freely browse and use ocw materials at your own pace. use ocw to guide your own life-long learning, or to teach others. modify, remix, and reuse (just remember to cite ocw as the source.)
figuring out each encoding is clearly the job for a computer, so we’ll create a simple programming language that will let 10 assembly language, models of computation. course home syllabus calendar. expand menu instructor insights. in this lecture we’ll describe the assembly language we’ll use for programming , microprocessor course mit, microprocessor course mit, mit opencourseware, compiler course mit, mit online engineering courses.
instructor: charles leiserson view the complete course pc assembly language, paul a. carter, july 2006. intel® 80386 x86 inline assembly programming, anthony aaby. “an assembly language is a low-level programming language for a computer, or other programmable device, in which , mit free online courses psychology, mit embedded systems course, mit cse, mit opencourseware epidemiology
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