Menu
I'm trying to understand the difference between using addi and add, does both do the same thing?
e.g
addi $t0, $0, $a0
add $t0 , $0, $a0
684
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.
The add instruction adds together its two operands, storing the result in its first operand. Note, whereas both operands may be registers, at most one operand may be a memory location. The inc instruction increments the contents of its operand by one. The dec instruction decrements the contents of its operand by one.
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.
Pseudo-instructions are legal MIPS assembly language instructions that do not have a direct hardware implementation. They are provided as a convenience for the programmer. When you use pseudo-instructions in a MIPS assembly language program, the assembler translates them into equivalent real MIPS instructions.
add adds the value in two registers
addi adds an immediate value (constant) to the register
This gives you some example.
94
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
