Instruction

Abstract

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• Also known as Machine Codes
• Bit String, which is passed to CPU, gets translated to carry out Operation
• Doesn’t specify which CPU Datapath does what, just specify what outputs are expected with a given input
• The instruction lifecycle can be broken down into Instruction Stages

Pseudo Instruction

• Syntactic sugar for a set of Instruction, so it is easier for programmers to use

Assigning value from one variable to another in MIPS

Instead of add $s0, $s1, $zero, we have pseudo-instruction move $s0, $s1.

Branch Instruction

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• An Instruction that causes CPU to jump to a different location in the codes of Process (进程), instead of executing instruction sequentially

Terminologies

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Single Instruction Multiple Data

• This allows one Instruction to operate on multiple data at once and have multiple outputs essentially
• This can reduce the number of instructions in a program significantly, and have more data processed without the involvement of the inefficient Main Memory

References

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• Reinventing the Processor - Youtube
• CONCURRENCY IS AN ILLUSION - YouTube