General registers in a processor, Computer Engineering

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In this segment, we will give very brief details of registers of a RISC system known as MIPS.

MIPS is a register-to-register or load/store architecture and employs three address instructions for data manipulation. It is due to register-register operands that you can have more operands in an instruction of 32 bits because register address are smaller. 

MIPS have 32 addressable registers = 25

⇒ 5 bits register address.

Table given below shows MIPS general purpose registers. 

MIPS register names start with a $. There are two naming conventions:

MIPS register names start with a $. There are two naming conventions:

  • By number:

                           $0   $1   $2    ...              $31

  • By (mostly) two-letter names like:

                           $a0 - $a3   $t0 - $t7   $s0 - $s7    $gp    $fp    $sp    $ra

Not all of these are general-purpose registers. The subsequent table explains how each general register is treated and actions you can take with each one of the registers. 

1353_GENERAL REGISTERS IN A PROCESSOR.png

Thus all the computers have some registers. However how exactly is instruction execution related to registers?  To explore this idea let's first consider the idea of Micro-operations.


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