| op | inst | notes
|
| 0x00 000000 | | i-format instruction
|
| 0x01 000001 | | floating-point instruction (ignore)
|
|
|
| jump
|
| 0x02 000010 | j label | absolute addressing
|
| 0x03 000011 | jal label | $31 <- PC
|
|
|
| branch
|
| 0x04 000100 | beqz $r1, label | PC+4-relative addressing
|
| 0x05 000101 | bnez $r1, label
|
| 0x06 000110 | bfpt | floating-point, not implemented
|
| 0x07 000111 | bfpf
|
|
|
| ALU immediate
|
| 0x08 001000 | addi $rd, $rs, immed
|
| 0x09 001001 | addui
|
| 0x0a 001010 | subi
|
| 0x0b 001011 | subui
|
| 0x0c 001100 | andi $rd, $rs, immed | $rd = $rs & immed
|
| 0x0d 001101 | ori
|
| 0x0e 001110 | xori
|
| 0x0f 001111 | lhi $rd, immed | $rd[31:16] = immed[15:0]
|
|
|
| Exceptions
|
| 0x10 010000 | rfe | not yet
|
| 0x11 010001 | trap | not yet
|
|
|
| jump register
|
| 0x12 010010 | jr $31
|
| 0x13 010011 | jalr $29 | $31 <- PC
|
|
|
| ALU: shift immediate
|
| 0x14 010100 | slli
|
| 0x15 010110 | srli
|
| 0x16 010111 | srai
|
|
|
| Set-on-condition immediate
|
| 0x18 011000 | seqi $rd, $r1, $r2 | $rd <- 1 if $r1==$r2
|
| 0x19 011001 | snei
|
| 0x1a 011010 | slti
|
| 0x1b 011011 | sgti
|
| 0x1c 011100 | slei
|
| 0x1d 011101 | sgei
|
|
|
| load/store (aligned only)
|
| 0x23 100011 | lw $reg, offset($rbase) | $reg <- Mem[$rbase+offset]
|
| 0x2b 101011 | sw $reg, offset($rbase) | Mem[$rbase+offset] <- $reg
|
|
|
| Set-on-condition immediate unsigned
|
| 0x30 110000 | sequi
|
| 0x31 110001 | sneui
|
| 0x32 110010 | sltui
|
| 0x33 110011 | sgtui
|
| 0x34 110100 | sleui
|
| 0x35 110101 | sgeui
|