COMPSCI 313 S Computer Organization. 7 MIPS Instruction Set
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1 COMPSCI 313 S Computer Organization 7 MIPS Instruction Set
2 Agenda & Reading MIPS instruction set MIPS I-format instructions MIPS R-format instructions 2
3 7.1 MIPS Instruction Set MIPS Instruction Set Language of the Machine More primitive than higher level languages No sophisticated control flow Very restrictive MIPS Arithmetic Instructions We ll be working with the MIPS instruction set architecture Similar to other architectures developed since the 1980's Used by NEC, Nintendo, Silicon Graphics, Sony Design goals Maximize performance and minimize cost, reduce design time 3
4 7.1 MIPS Instruction Set MIPS Instruction Set Instructions are encoded in binary Called machine code MIPS instructions Encoded as 32-bit instruction words Small number of formats encoding operation code (opcode), register numbers, Regularity! 4
5 7.1 MIPS Instruction Set MIPS Instruction Set Instruction complexity is only one variable Lower instruction count vs. higher CPI / lower clock rate Design Principles: Simplicity favors regularity Smaller is faster Good design demands compromise Make the common case fast Instruction set architecture A very important abstraction indeed! 5
6 7.1 MIPS Instruction Set MIPS Registers Registers more versatile: MIPS arithmetic instructions can read 2, operate on them, and write 1 per instruction MIPS data transfer only read or write 1 operand per instruction, and no operation Fast location data Data must be in registers to perform arithmetic instruction 32 general-purpose registers Program counter (PC, 32-bits) stores the current instruction address 6
7 7.1 MIPS Instruction Set MIPS Registers (for compilation) $at(1), $k0(26) and $k1(27) are reserved for the assembler and operating system and should not be used by user program $a0-$a3(4-7) are used to pass the first four arguments to routines (remaining arguments are passed on the stack) $v0-$v1(2,3) are used to return values from function $t0-t9 (8-15, 24, 25) are caller-saved registers that hold temporary quantities that need not be preserved across calls $s0-s7 (16-23) are callee-saved registers that hold long-lived values that should be preserved across calls $gp (28) is the global pointer that points to the middle of a 64K memory in the static data segment $sp (29) is the stack pointer that points to the first free location of the stack $ra (31) is used to store the return address from a procedure call $fp (30) is the frame pointer 7
8 7.1 MIPS Instruction Set MIPS Registers (for compilation) Register name Number Usage $zero 0 Constant 0 $at 1 Reserved for assembler $v0, $v1 2, 3 Result of a function $a0-$a3 4-7 Function arguments $t0-$t9 8-15, 24, 25 Temporary $s0-$s Saved temporary $k0, $k1 26,27 Reserved of OS $gp 28 Pointer to global area $sp 29 Stack pointer $fp 30 Frame pointer $ra 31 Return address of function 8
9 7.2 MIPS R-format Instructions MIPS R-format Instruction fields op: operation code (opcode) rs: first source register number rt: second source register number rd: destination register number shamt: shift amount (00000 for now) funct: function code (extends opcode) op rs rt rd shamt funct 6 bits 5 bits 5 bits 5 bits 5 bits 6 bits 9
10 7.2 MIPS R-format Instructions R-format Example add $t0, $s1, $s2 special $s1 $s2 $t0 0 add = op rs rt rd shamt funct 6 bits 5 bits 5 bits 5 bits 5 bits 6 bits 10
11 Base MIPS R-format Instructions MIPS R-format Compact representation of bit strings 4 bits per hex digit c d a 1010 e b 1011 f 1111 Example: eca
12 7.3 MIPS I-format Instructions MIPS I-format Immediate arithmetic and load/store instructions rt: destination or source register number Constant: 2 15 to Address: offset added to base address in rs Design Principle 4: Good design demands good compromises Different formats complicate decoding, but allow 32-bit instructions uniformly Keep formats as similar as possible op rs rt constant or address 6 bits 5 bits 5 bits 16 bits 12
13 7.3 MIPS I-format Instructions MIPS I-format addi $s3, $s2, 0x5f addi $s2 $s3 5f f = f 16 op rs rt constant or address 6 bits 5 bits 5 bits 16 bits 13
14 7.3 MIPS I-format Instructions MIPS Instruction Examples add $s2, $s1, $s0 0x addi $s2, $s1, 0x6f 0x F sub $s3, $s2, $s4 0x andi $s1, $s0, 0x4c 0x C 14
15 7.3 MIPS I-format Instructions Stored Program Computers Instructions represented in binary, just like data Instructions and data stored in memory Programs can operate on programs e.g., compilers, linkers, Binary compatibility allows compiled programs to work on different computers Standardized ISAs The BIG Picture 15
16 7.4 Logical Operations Logical Operations Instructions for bitwise manipulation Operation C Java MIPS Shift left << << sll Shift right >> >>> srl Bitwise AND & & and, andi Bitwise OR or, ori Bitwise NOT ~ ~ nor Useful for extracting and inserting groups of bits in a word 16
17 7.4 Logical Operations Shift Operations shamt: how many positions to shift Shift left logical Shift left and fill with 0 bits sll by i bits multiplies by 2 i Shift right logical Shift right and fill with 0 bits srl by i bits divides by 2 i (unsigned only) op rs rt rd shamt funct 6 bits 5 bits 5 bits 5 bits 5 bits 6 bits 17
18 7.4 Logical Operations Exercise 7.1 Q1.1. Assume the following register contents: $t0 = 0xAAAAAAAA For the register values shown above, what is the value of $t2 for the following sequence of instructions? sll $t2, $t0, 4 18
19 7.4 Logical Operations AND Operations Useful to mask bits in a word Select some bits, clear others to 0 and $t0, $t1, $t2 $t2 $t1 $t
20 7.4 Logical Operations OR Operations Useful to include bits in a word Set some bits to 1, leave others unchanged or $t0, $t1, $t2 $t2 $t1 $t
21 7.4 Logical Operations NOT Operations Useful to invert bits in a word Change 0 to 1, and 1 to 0 MIPS has NOR 3-operand instruction a NOR b == NOT ( a OR b ) nor $t0, $t1, $zero Register 0: always read as zero $t1 $t
22 7.4 Logical Operations Exercise 7.2 Q2.1. Provide the type, assembly language instruction, and binary representation of instruction described by the following MIPS fields: op=0, rs=3, rt=2, rd=3, shamt=0, funct=34 Q2.2. Provide the type, assembly language instruction, and binary representation of instruction described by the following MIPS fields: op=0x23, rs=1, rt=2, const=0x4 22
23 Conditional Operations Branch to a labeled instruction if a condition is true Otherwise, continue sequentially beq rs, rt, L1 if (rs == rt) branch to instruction labeled L1; bne rs, rt, L1 if (rs!= rt) branch to instruction labeled L1; j L1 7.5 Instructions for Making Decisions unconditional jump to instruction labeled L1 23
24 Compiling If Statements C code: 7.5 Instructions for Making Decisions f, g, in $s0, $s1, if (i==j) f = g+h; else f = g-h; Compiled MIPS code: bne $s3, $s4, Else add $s0, $s1, $s2 j Exit Else: sub $s0, $s1, $s2 Exit: 24
25 Compiling Loop Statements C code: 7.5 Instructions for Making Decisions while (save[i] == k) i += 1; i in $s3, k in $s5, address of save in $s6 Compiled MIPS code: Loop: sll $t1, $s3, 2 add $t1, $t1, $s6 lw $t0, 0($t1) bne $t0, $s5, Exit addi $s3, $s3, 1 j Loop Exit: 25
26 7.5 Instructions for Making Decisions Basic Blocks A basic block is a sequence of instructions with No embedded branches (except at end) No branch targets (except at beginning) A compiler identifies basic blocks for optimization An advanced processor can accelerate execution of basic blocks 26
27 7.5 Instructions for Making Decisions More Conditional Operations Set result to 1 if a condition is true Otherwise, set to 0 slt rd, rs, rt if (rs < rt) rd = 1; else rd = 0; slti rt, rs, constant if (rs < constant) rt = 1; else rt = 0; Use in combination with beq, bne slt $t0, $s1, $s2 # if ($s1 < $s2) bne $t0, $zero, L # branch to L 27
28 7.5 Instructions for Making Decisions Branch Instruction Design Why not blt, bge, etc? Hardware for <,, slower than =, Combining with branch involves more work per instruction, requiring a slower clock All instructions penalized! beq and bne are the common case This is a good design compromise 28
29 7.5 Instructions for Making Decisions Signed vs. Unsigned Signed comparison: slt, slti Unsigned comparison: sltu, sltui Example $s0 = $s1 = slt $t0, $s0, $s1 # signed 1 < +1 $t0 = 1 sltu $t0, $s0, $s1 # unsigned +4,294,967,295 > +1 $t0 = 0 29
30 Summary On completion of this module, you are able to Familiar with the MIPS instruction set Write simple programs with MIPS instructions References: Textbook - Computer Organization and Design - The Hardware Software Interface Chapter 2 30
31 Q & A (break) 5-10 minutes break 31
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