What are Hi and Lo registers in MIPS?

The HI and LO registers are 32-bit registers which hold or accumulate the results of a multiplication or addition. You cannot operate on them directly. They are set by a suitable arithmetic operation, and by special instructions for moving values in and out.

How many registers are in MIPS?

MIPS has 32 floating-point registers.

How do I clear my MIPS register?

You can simply use the $zero register as a reference and write its value, which is 0 or 0b00000000, into the register you want to clear up.

Which MIPS register to use?

The MIPS processor has one standard register file containing 32 32-bit registers for use by integer and logic instructions….Table 5.3. MIPS Registers.

Register Number Conventional Name Usage
$28 $gp Global Area Pointer (base of global data segment)
$29 $sp Stack Pointer
$30 $fp Frame Pointer
$31 $ra Return Address

How do you use MFHI in MIPS?

As in Task-1, the instructions mfhi and mflo will be used to copy the contents of the registers HI and LO respectively into some destination register Rd. mfhi means “move from HI” to the destination register. mflo means “move from LO” to the destination register.

What does Lui do in MIPS?

lui is “load upper immediate”, with “upper” meaning the upper 16 bits, and “immediate” meaning that you are giving it a literal value (4097).

What is the program counter in MIPS?

The Program Counter (PC) The program counter (sometimes called instruction pointer) is a special-purpose register that contains the memory address of the next instruction to be executed. Every instruction is fetched from external memory at the address in the program counter, and stored in the instruction register.

Is SUBI a command in MIPS?

The MIPS creators realized that there isn’t a need for subi (because you can add a negative number with addi using 2’s complement), and they simply made the decision to forego making that instruction. It may have been to conserve the number of instructions, or just simply because it isn’t needed. Thanks a lot.

What are Hi and LO registers in MIPS?

The incomplete integer instruction-set reference (linked in the question) for early MIPS also has some details, http://www.mrc.uidaho.edu/mrc/people/jff/digital/MIPSir.html, or see MIPS’s official PDF manuals, or PDFs of manuals for classic MIPS CPUs. HI and LO are not numbered registers, IIRC.

Where does the result of multiplying go in MIPS?

The result automatically goes into two special registers called HI and LO. The semantics are given below: We know that multiplying the contents of two 32-bit registers will give a 64-bit result. The high 32 bits are placed in a register called HI. The low 32 bits are placed in a register called LO.

What are the Div and divu instructions in MIPS?

Integer Division in the MIPS Assembly Language. The generic form of the div (signed integer division) and divu (unsigned integer division) instructions is: div and divu belong to the Arithmetic Core Instruction Set and are R-type instructions where $Rd, the destination register, does not appear. The registers HI and LO are used here as well.

When to use hi and Lo Stack Overflow?

HI and LO are not numbered registers, IIRC. They are only used to store the results of operations that would not fit in a single register (e.g. multiplying two 32-bit integers could result in a 64 bit integer, so the overflow goes in HI).