MIPS and SPIM tutorial

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loop.s .text .globl main main: add $t0, $zero, $zero # loop counter i addi $s0 ,$zero, 5 # loop limit N You should be loop: beq $t0, $s0, done # for i = 0...(N-1) Choose descriptive names for your labels. able to understand what the add $a0, $zero, $t0 # print i # system program call code does for print_int li by $v0, only 1 looking syscall at the comments and the labels. addi $t0, $t0, 1 # i ++ Example of good comments j loop # loop again done: jr $ra # return to caller Introduce abstractions in your comments. Refer to previously defined. abstractions.
loop.s .text .globl main main: add $t0, $zero, $zero # loop-counter i addi $s0 ,$zero, 5 # loop limit N If you start with the comments and the labels you can use them as your loop: beq $t0, $s0, done # for i = 0...(N-1) add $a0, $zero, $t0 # print i # system ”recipe” call code for for the print_int li $v0, program, 1 syscall translating the comments and labels into MIPS assembly addi $t0, $t0, 1 # i ++ j loop # loop again done: jr $ra # return to caller
Page 1 and 2: MIPS and SPIM tutorial Part Four: S
Page 3 and 4: .asciiz A directive that stores a N
Page 5 and 6: Load Byte: lb Ok, just like Load Wo
Page 7 and 8: The label STR is refering to the ad
Page 9 and 10: Load Byte $t2 is 0x00000061 The con
Page 11 and 12: Load Byte $t4 is 0x00000063 The con
Page 13 and 14: Word stored in $t1 Character ’d
Page 15 and 16: x68 1 Word Character ’d’ ’c
Page 17 and 18: A MIPS processor can be configured
Page 19 and 20: When you run this program, a consol
Page 21: loop.s .text .globl main main: add
Page 25 and 26: Load the source file loop.s
Page 27 and 28: Machine Instruction: 0x11100006 Hex
Page 31 and 32: if_then_else.s Branch Not Equal: bn
Page 33 and 34: array.s ARRAY is a label, i.e, the
Page 35 and 36: array.s ARRAY: .word 1 1 2 3 5 8 13
Page 37 and 38: Example: 5 10 = 00101 2 A clever wa
Page 41 and 42: array_of_string.s Declear three str
Page 43 and 44: array_of_string.s (text segment par
Page 45 and 46: ASCII(’h’) = 0x68 ASCII(’e’
Page 47: You are now done with part four of

MIPS and SPIM tutorial

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