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所以我想在MIPS彙編代碼中編寫一個程序來幫助我更好地理解浮點數加法的工作原理。我理解浮點數如何分解爲1位符號,8位指數和23位小數。我編寫了一個程序,它可以從用戶獲取兩個輸入,並且不使用mtc1和mfc1(用於輸入和輸出)之外的任何浮點指令添加它們。我的代碼有錯誤,因爲當我添加1 + 2時,我得到2.74804688。我仍然試圖調試代碼,但似乎無法掌握問題。如果任何人都可以提供幫助,我將不勝感激。Mips浮點數加
這是我的代碼(不含用戶輸入...第一個浮點值是$ S0,並在$ s1的第二個),特別是
#Integer implementation of floating-point addition
#Initialize variables
add $s0,$t0,$zero #first integer value
add $s1,$t1,$zero #second integer value
add $s2,$zero,$zero #initialize sum variable to 0
add $t3,$zero,$zero #initialize SUM OF SIGNIFICANDS value to 0
#get EXPONENT from values
sll $s5,$s0,1 #getting the exponent value
srl $s5,$s5,24 #$s5 = first value EXPONENT
sll $s6,$s1,1 #getting the exponent value
srl $s6,$s6,24 #$s6 = second value EXPONENT
#get SIGN from values
srl $s3,$s0,31 #$s3 = first value SIGN
srl $s4,$s1,31 #$s4 = second value SIGN
#get FRACTION from values
sll $s7,$s0,9
srl $s7,$s0,9 #$s7 = first value FRACTION
sll $t8,$s1,9
srl $t8,$s1,9 #$t8 = second value FRACTION
#compare the exponents of the two numbers
compareExp: ######################
beq $s5,$s6, addSig
blt $s5,$s6, shift1 #if first < second, go to shift1
blt $s6,$s5, shift2 #if second < first, go to shift2
j compareExp
shift1: #shift the smaller number to the right
srl $s7,$s7,1 #shift to the right 1
addi $s5,$s5,1
j compareExp
shift2: #shift the smaller number to the right
#srl $s0,$s0,1 #shift to the right 1
#j compareExp
srl $t8,$t8,1 #shift to the right 1
addi $s6,$s6,1
j compareExp
addSig:
add $t3,$s7,$t8 #Add the SIGNIFICANDS
li $v0, 4
la $a0, sum
syscall
li $v0, 1
move $a0, $t3
syscall
j result
result:
li $v0, 4
la $a0, newline
syscall
sll $t4,$s3,31 #SIGN
#FRACTION
sll $t5,$s6,23 #EXPONENT
add $t6,$t4,$t5
add $t6,$t6,$t3
li $v0, 4
la $a0, sum2
syscall
li $v0, 1
move $a0, $t6
syscall
li $v0, 4
la $a0, newline
syscall
li $v0, 4
la $a0, sum2
syscall
li $v0,2
mtc1 $t6,$f12
syscall
jr $31
# END OF PROGRAM