Instruction Set

1
Instruction Set

• ALU
• Load/Store (Memory)
• Branch

2
ALU

• Add r1, r2, r3 r1r2r3
• Sub, and, xor, or,
• AddI r1, 100, r3 r1100r3
• Sub, and, xor, or,
• SXX r1, r2, r3
• XX GT, GE, LT, LE
• SGT r1, r2, r3 r11 if r2gtr3 else r10
• SXXI r1, 100, r3

3
Load/Store

• Loads
• LW r1, 100(r4) r1Mem100r4
• LB r1, 100(r4) r1Mem100r4
• Stores
• SW 100(r4), r1 Mem100r4r1
• SB 100(r4), r1 Mem100r4r1

4
Branch and Jumps

• Jumps (unconditional)
• J label
• JR r1
• Branches (conditional)
• BEQZ r1, label if r10 goto loop
• BNEQZ r1, label if r1!0 goto loop
• Subroutines
• JAL label goto label R31return address
• JALR r1 goto (r1) R31return address

5
Floating point

• Single precision
• Addf f0, f1, f2
• Subf, multf, divf,
• Double precision
• Addd f0, f2, f4
• Subd, multd, divd,