Post

MIPS celsius to fahrenheit

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## Celsius to fahrenheit

  


.data
msg:
.asciiz "Enter celsius : "
const9:
.float 9.0
const5:
.float 5.0
const32:
.float 32.0
zeroF:
.float 0.0

  


  


.text

.globl main
main:
## Expand stack and save $ra

addi $sp, $sp, -4

sw $ra, ($sp)




li $v0, 4
## print\_str syscall number

la $a0, msg
## arg0 : msg

syscall




li $v0, 6
## read\_float syscall number

syscall
## $f0 - user input float number




jal c2f




li $v0, 2
## print\_float syscall number

lwc1 $f4, zeroF
## $f4 = 0.0

add.s $f12, $f0, $f4
## move $f0 to $f12. $f12 is arg.

syscall




## Shrink stack and load $ra

lw $ra, ($sp)

addi $sp, $sp, 4




jr $ra



c2f:
lwc1 $f16, const5
## $f16 = 5.0 (ldc1, load double coprocess1)

lwc1 $f18, const9
## $f18 = 9.0

div.s $f18, $f18, $f16
## $f18 = 9.0 / 5.0

mul.s $f0, $f0, $f18
## $f0 = $f0 \* 9/5

lwc1 $f16, const32

add.s $f0, $f0, $f16
## $f0 = $f0 + 32

jr $ra

실수를 계산하는 coprocessor 레지스터($f0, $f1, ...)와 정수 레지스터간 데이터 교환

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mtc1 $t0, $f0    #move to coprocess1
mfc1 $t0, $f0    #move from coprocess1

실수↔정수 형변환

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cvt.s.w $f0, $f0    # Convert to Single from Integer
cvt.w.s $f0, $f0    # Convert to Integer from Single

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