MIPS

Saved:

• $s0-$s7

Temp:

• $t0-$t9

Arg:

• $a0-$a3

Return:

• $v0 for lower 32
• $v1 for upper 32 but still only one register

Floating point:

• $f0-$f31

Stack

• $sp

Frame

• $fp

Return address

• $ra

8-bit = byte (b)
16-bit = half-world (h)
32-bit = word (w)
64-bit = does not exist

lb/lh/lw <dest>, <src>

• Reads from <src> and writes to <dest> where <src> is a var

li <dest>, <src>

• Reads from <src> and writes to <dest> where <src> is an immediate

la <dest>, <src>

• Reads from <src> and writes to <dest> where <src> is an address

move <dest>, <src>

• Same as load, but for reg to reg

sb/sh/sw <src>, <dest>

• Reads from <src> and writes to <dest> where <dest> is a var

add <dest>, <src1>, <src2>

• <dest> = <src1> + <src2>
• sub, mul, div, rem are the same

Branch commands:

• b <src1>, <src2>, <dest>
• bgt, bge, blt, ble
• beq, bne
• Compares to zero: bgtz, bgez, bltz, blez

Declaring .data:

• <varName>: .<size> <value>
• ex: length: .byte 5
• <varName>: .space <value>
• ex: length: .space 5 (in bytes)

.globl <label>
label:
some code
jr $ra

jal <funcName>