我被要求用 mips 汇编语言编写一个程序来执行一些基本的算术运算,例如将摄氏温度转换为华氏温度。由于我使用了伪指令,我最终在这项作业中得到了很差的成绩。我不知道我什至在使用伪指令,因为看起来许多在线教程都在没有太多说明的情况下使用它们。
出于好奇,我想知道是否有人可以解释如何将伪指令转换为非伪指令?
下面是我的带有伪指令的工作程序:
## 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 = "
我的一个朋友告诉我,Spim 模拟器实际上会自动转换伪指令并显示它。他说将其复制并粘贴到记事本中并进行较小的更改。我仍然很困惑。
这就是我最终复制和修改的内容:
.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#