What does Addi mean in MIPS?

Add immediate, addi, is another common MIPS instruction that uses an immediate operand. addi adds the immediate specified in the instruction to a value in a register, as shown in Code Example 6.9.

What is Addi add?

add adds the value in two registers. addi adds an immediate value (constant) to the register.

What is the difference between the MIPS addi instruction and Addiu instruction?

The only difference between addi and addiu is that addiu doesn’t check for overflow. (It still sign-extends!) (zero-extended!)

Is Addi signed or unsigned?

The only difference between the signed instructions add, addi and sub, and the unsigned ones addu, addiu, and subu, is that the unsigned ones do not generate overflow exceptions. The immediate fields of addiu and sltiu are sign-extended!

How do you use add in MIPS?

How does SLL work MIPS?

The sll instruction isn’t limited to just shifting by 1 bit; you can specify a shift amount in the range 0.. 31 (a shift by 0 might seem useless, but SLL $zero, $zero, 0 is used to encode a NOP on MIPS). A logical left shift by N bits can be used as a fast means of multiplying by 2^N (2 to the power of N).

How many registers are in MIPS?

MIPS has 32 floating-point registers.

What is Li and La in MIPS?

li stands for Load Immediate and is a convenient way of loading an immediate up to 32 bits in size. Instructions like addi and ori can only encode 16-bit immediates, so the assembler may translate li into multiple instructions. … Some assemblers may also allow you to do things like la $t0, 8($t1) # t0 = t1 + 8 .

What is SRA MIPS?

SRA — Shift right arithmetic

Description: Shifts a register value right by the shift amount (shamt) and places the value in the destination register. The sign bit is shifted in.

What are the 32 registers in MIPS?

The MIPS R2000 CPU has 32 registers. 31 of these are general-purpose registers that can be used in any of the instructions. The last one, denoted register zero, is defined to contain the number zero at all times.

What is register $1 and what does it do?

$1 ($at) is reserved for use by MIPS pseudo-instructions that are translated *by the assembler* into multiple MIPS machine language instructions. Most registers are allocated by the compiler to hold temporary or long-term values, but a few have special purposes, and $1 is one of those.

What is the PC register in MIPS?

The Program Counter (PC) is a register structure that contains the address pointer value of the current instruction. Each cycle, the value at the pointer is read into the instruction decoder and the program counter is updated to point to the next instruction.

Is MIPS big endian or little endian?

Since MIPS assumes a Big Endian organization, the book will label the MSB as bit 0, and the LSB as bit 31 in a word, and is bit 63 in a double word.

Is MIPS Harvard architecture?

Now, as Mips has two separate memories: Program Memory, which is used for fetching the instruction from it and data memory/main memory which is used at Memory stage to store/load data. Therefore MIPS is more close to Harvard Architecture.


The MIPS processor, designed in 1984 by researchers at Stanford University, is a RISC (Reduced Instruction Set Computer) processor. Compared with their CISC (Complex Instruction Set Computer) counterparts (such as the Intel Pentium processors), RISC processors typically support fewer and much simpler instructions.

What processors use MIPS?

Five most iconic devices to use MIPS CPUs
  • SGI Indigo (MIPS R3000) The SGI Indigo was a line of workstation computers created by Silicon Graphics (SGI). …
  • Sony PlayStation (MIPS R3000 CPU) …
  • Nintendo 64 (MIPS R4300i CPU) …
  • NEC Cenju-4 (MIPS R10000 CPU) …
  • Tesla Model S (MIPS I-class CPU)

Is MIPS a small endian processor?

So far it does not matter, whether the target MIPS platform is little or big endian, as long as byte-sized memory is involved, the order of bytes is “normal”.

In what byte order do MIPS registers store values big endian or little endian?

MIPS is little-endian. One result of this is that character data appear to be stored “backwards” within words.

Does anyone still use MIPS?

Answering your second question: yes, MIPS processors are still in use. They’re frequently the processors used in things like routers and other small computing appliances like that. They’re also increasingly appearing in small home computing devices in Asian marketplaces (Lemote, for example).

Is x86 a MIPS?

What is the difference between RISC V and MIPS?

Like RISC-V, MIPS is a RISC architecture, but one with a long history. … While RISC-V is gaining grown the storied history of MIPS means that the MIPS stack is far more complete, and includes things like DSP and SIMD extensions that still don’t exist for the RISC-V platform.

Is MIPS hard to learn?

MIPS is a pretty nice assembly language to learn. It’s simple and orthogonal, and leads nicely to discussions of pipelined CPUs because that’s what it was designed for. (No microcoded instructions, and very regular machine-code format that’s easy to decode.)

Why is ARM more popular than MIPS?

ARM has a high throughput and a great efficiency than MIPS because ARM processors support 64-bit data buses between the core and the caches. … MIPS has no equivalent instruction to the ARM MOV instruction. • The MIPS ADD instruction normally generates an exception on overflow, so it is rarely used than in ARM.

What happened MIPS processors?

MIPS provides processor architectures and cores for digital home, networking, embedded, Internet of things and mobile applications. … Wave declared bankruptcy in 2020, emerging in 2021 as MIPS and announcing that the MIPS architecture was being abandoned in favor of RISC-V designs.