I was asked to write a program in mips assembly language to perform some basic arithmetic such as converting a temperature in Celsius to Fahrenheit. I ended up receiving a poor grade on this assignment because I used pseudo-instructions. I was unaware that I was even using pseudo-instructions because it appears many tutorials online use them without much clarification.
Out of curiosity I was wondering if someone could explain how to convert pseudo-instructions into non-pseudo-instructions?
below is my working program with pseudo-instructions:
## convert temperature from celsius to fahrenheit
## F = (9*C/5)+32
.text
.globl main
main: # execution starts here
la $a0,getCelsius # ask user for temperature in celcius
li $v0,4 # print message to console
syscall
li $v0,5 # read integer from console
syscall
mul $t0,$v0,9 # compute ($v0 * 9)
div $t0,$t0,5 # compute ($v0 * 9) / 5
addi $t0,$t0,32 # compute (($v0 * 9) / 5) + 32
la $a0,tempF # print message to console
li $v0,4
syscall
move $a0,$t0 # print result of (($v0 * 9) / 5) + 32
li $v0,1
syscall
li $v0,10 # Done
syscall
.data
getCelsius: .asciiz "Enter celsius temperature: "
tempF: .asciiz "Fahrenheit temperature = "
A friend of mine told me that the Spim simulator actually converts the pseuo-instructions automatically and displays it. He said to copy and paste it into note padd and make minor changes. I'm still confused.
this is what I ended up copying and modifying:
.text
.globl main
main:
lui $11, 0x1001 [getCelsius] # la $a0,getCelsius ask user for temperature
in celcius#
ori $4, $11, 0 [getCelsius]
ori $2, $0, 4 # li $v0,4 print message to console#
syscall # syscall
ori $2, $0, 5 # li $v0,5 read integer from console#
syscall # syscall
ori $11, $0, 9 # mul $t0,$v0,9 compute ($v0 * 9)#
mul $8, $2, $11
ori $11, $0, 5 # div $t0,$t0,5 compute ($v0 * 9) / 5#
div $8, $11
mflo $8
addi $8, $8, 32 # addi $t0,$t0,32 compute (($v0 * 9) / 5) + 32#
lui $11, 0x1001 [tempF] # la $a0,tempF print message to console#
ori $4, $11, 28 [tempF]
ori $2, $0, 4 # li $v0,4
syscall # syscall
addu $4, $0, $8 # move $a0,$t0 print result of (($v0 * 9) / 5) + 32#
ori $2, $0, 1 # li $v0,1
syscall # syscall
ori $2, $0, 10 # li $v0,10 Done#