| Register Number | Mnemonic Name | Conventional Use | Register Number | Mnemonic Name | Conventional Use | |
|---|---|---|---|---|---|---|
| $0 | zero | Permanently 0 | $24, $25 | $t8, $t9 | Temporary | |
| $1 | $at | Assembler Temporary (reserved) | $26, $27 | $k0, $k1 | Kernel (reserved for OS) | |
| $2, $3 | $v0, $v1 | Value returned by a subroutine | $28 | $gp | Global Pointer | |
| $4-$7 | $a0-$a3 | Arguments to a subroutine | $29 | $sp | Stack Pointer | |
| $8-$15 | $t0-$t7 | Temporary (not preserved across a function call) | $30 | $fp | Frame Pointer | |
| $16-$23 | $s0-$s7 | Saved registers (preserved across a function call) | $31 | $ra | Return Address |
There are also 32 floating point registers $f0--$f31.