我可以做些什么来进一步优化我的 MIPS 代码？
What can I do to optimize my MIPS code further?
我正在尝试优化我的作业代码。我需要将总能量输出减少至少 5%。我在下面包含了我的代码。到目前为止，我只能将能量输出降低 2%。这是通过调整我的 sub $t0,$t0, 32 并引入另一个初始化为 -32 的寄存器 ($t8) 并将上面的代码替换为 add $t0,$t0,$t8.This 代码行来实现的标签 LowerCasePoint.
该代码的目的是输入一个句子并计算特定字母的字符数，然后以数字和井号显示该计数。
我已经盯着我的代码看了好几个小时，试图弄清楚我能做什么，但没有什么是突然出现在我面前的。任何帮助将不胜感激。
谢谢
#NAme
#Comp Org
#Homework 2A
.data
string: .asciiz "\nEnter A String:" #prompts the user to input a string
input: .space 1000
.text
li $v0,4 #printing the string
la $a0,string #prompt for the string
syscall #executing
li $v0,8
la $a0,input #prompting for the users input
li $a1,1000 #loading 1000 into the register
syscall
move $s0,$a0 #moving the data into the new register
li $t0,0 #this register will be used for the count of c
li $t1,0 #this register will be used for the count of h
li $t2,0 #this register will be used for the count of a
li $t3,0 #this register will be used for the count of r
li $t4,0 #this register will be used for the count of e
li $t5,0 #this register will be used for the count of o
li $t6,0 #this register will be used for the count of n
li $t7,0 #this register will be used for the count of g
li $t8,-32 #this will be used for the addition
loop: #loop for the string
lb $a0,0($s0) #load the first character into $a0
addi $s0,$s0,1 #used as an index and increments by 1
beq $a0,$zero,done #used as the else clause
sge $s5,$a0,'a' #checks for the lowercase range
sle $s6,$a0,'z' #checks for the lowercase range
and $s5,$s5,$s6 #and condition used to check between the range of lowercase
beq $s5,1,lowercaseCount #branch to lowercase label
j calculate #jump to calculate label
lowercaseCount:
add $a0,$a0,$t8 #subtracts 32 from the value stored in $a0
calculate:
beq $a0,'C',cCount #branching and checking for capital occurences for each one
beq $a0,'H',hCount
beq $a0,'A',aCount
beq $a0,'R',rCount
beq $a0,'E',eCount
beq $a0,'O',oCount
beq $a0,'G',gCount
beq $a0,'N',nCount
j exitCount
gCount:
add $t7,$t7,1 #incrementing gCount by 1
j exitCount
cCount:
add $t0,$t0,1 #Incrementing cCount by 1
j exitCount
hCount:
add $t1,$t1,1 #incrementing hCount by 1
j exitCount
aCount:
add $t2,$t2,1 #Incrementing aCount by 1
j exitCount
rCount:
add $t3,$t3,1 #incrementing rCount by 1
j exitCount
eCount:
add $t4,$t4,1 #Incrementing eCount by 1
j exitCount
oCount:
add $t5,$t5,1 #incrementing oCount by 1
j exitCount
nCount:
add $t6,$t6,1 #incrementing nCount by 1
exitCount:
j loop
done:
li $a0,'C' #checks for the uppercase letter and moves into the new register
move $a1,$t0 #and moves into the new register
jal printCount
li $a0,'H' #checks for the uppercase letter and moves into the new register
move $a1,$t1 #and moves into the new register
jal printCount
li $a0,'A' #checks for the uppercase letter and moves into the new register
move $a1,$t2 #and moves into the new register
jal printCount
li $a0,'R' #checks for the uppercase letter and moves into the new register
move $a1,$t3 #and moves into the new register
jal printCount
#li $a0,'G' #checks for the uppercase letter and moves into the new register
#move $a1,$t7 #and moves into the new register
#jal printCount
li $a0,'E' #checks for the uppercase letter and moves into the new register
move $a1,$t4 #and moves into the new register
jal printCount
li $a0,'O' #checks for the uppercase letter and moves into the new register
move $a1,$t5 #and moves into the new register
jal printCount
li $a0,'N' #checks for the uppercase letter and moves into the new register
move $a1,$t6 #and moves into the new register
jal printCount
li $a0,'G' #checks for the uppercase letter and moves into the new register
move $a1,$t7 #and moves into the new register
jal printCount
move $v0,$a0 #moves the register
li $v0,11 #prints the character
syscall
li $a0, 'C' #loads C into register
move $a1,$t0 #moves value of $t0 into a1
syscall
jal printhash #jump and link to printhash
li $a0, 'H' #loads H into register
move $a1,$t1 #moves value of $t1 into $a1
syscall
jal printhash #jump n link to printhash
li $a0, 'A' #loads A into register
move $a1,$t2 #move the register from $t2 into $a1
syscall
jal printhash
li $a0, 'R' #loads R into register
move $a1,$t3 #move the register from $t3 into $a1
syscall
jal printhash #jumps to printhash
li $a0,'E' #loads E into register
move $a1,$t4 #move the register from $t4 into $a1
syscall
jal printhash #jumps to printhash
li $a0, 'O' #loads O into register
move $a1,$t5 #move the register from $t5 into $a1
syscall
jal printhash #jumps to print hash
li $a0,'N' #loads N into register
move $a1,$t6 #move the register from $t6 into $a1
syscall
jal printhash #jumps to printhash
li $a0, 'G' #loads G into register
move $a1,$t7 #move the register from $t7 into $a1
syscall
jal printhash #jumps to printhash
li $v0,10 #syscall to terminate the program once this loop has been executed
syscall
printCount:
move $v0,$a0 #prints the character
li $v0,11
syscall
li $a0,':' #prints the character
li $v0,11
syscall
move $a0,$a1 #prints the current count
li $v0,1
syscall
li $a0,'\n' #prints the newline
li $v0,11
syscall
jr $ra
printhash:
#move $v0,$a0 #prints the character
#li $v0,11
#syscall
li $a0,':' #prints the character
li $v0,11
syscall
move $a0,$a1 #prints the current count
li $s7,0 #indexing for the loop
hash:
bge $s7,$a1,exithash #loop condition branch to exit loop if equal
li $a0,'#' #loads # into the register
syscall
addi $s7,$s7,1 #adding 1 to the value in the register $s7
j hash #jumping back to the start of the loop
exithash: #label of exit loop
li $a0,'\n' #loading new line
li $v0,11 #printing the new line
syscall #executing syscal
jr $ra #jumping back to register $t1
您有：
beq .... lowercaseCount
j calculate
lowercaseCount:
...
calculate:
此 beq 分支围绕单个跳转指令。那可以优化去掉跳转，如下：分支代替计算，条件相反！
bne calculate
...
calculate:
此外，您有 j exitCount 并且确实有 j loop。
这是一个无条件分支到另一个无条件分支，可以优化。将所有 j exit 替换为 j loop 以跳过不必要的跃点。
我正在尝试优化我的作业代码。我需要将总能量输出减少至少 5%。我在下面包含了我的代码。到目前为止，我只能将能量输出降低 2%。这是通过调整我的 sub $t0,$t0, 32 并引入另一个初始化为 -32 的寄存器 ($t8) 并将上面的代码替换为 add $t0,$t0,$t8.This 代码行来实现的标签 LowerCasePoint.
该代码的目的是输入一个句子并计算特定字母的字符数，然后以数字和井号显示该计数。
我已经盯着我的代码看了好几个小时，试图弄清楚我能做什么，但没有什么是突然出现在我面前的。任何帮助将不胜感激。
谢谢
#NAme
#Comp Org
#Homework 2A
.data
string: .asciiz "\nEnter A String:" #prompts the user to input a string
input: .space 1000
.text
li $v0,4 #printing the string
la $a0,string #prompt for the string
syscall #executing
li $v0,8
la $a0,input #prompting for the users input
li $a1,1000 #loading 1000 into the register
syscall
move $s0,$a0 #moving the data into the new register
li $t0,0 #this register will be used for the count of c
li $t1,0 #this register will be used for the count of h
li $t2,0 #this register will be used for the count of a
li $t3,0 #this register will be used for the count of r
li $t4,0 #this register will be used for the count of e
li $t5,0 #this register will be used for the count of o
li $t6,0 #this register will be used for the count of n
li $t7,0 #this register will be used for the count of g
li $t8,-32 #this will be used for the addition
loop: #loop for the string
lb $a0,0($s0) #load the first character into $a0
addi $s0,$s0,1 #used as an index and increments by 1
beq $a0,$zero,done #used as the else clause
sge $s5,$a0,'a' #checks for the lowercase range
sle $s6,$a0,'z' #checks for the lowercase range
and $s5,$s5,$s6 #and condition used to check between the range of lowercase
beq $s5,1,lowercaseCount #branch to lowercase label
j calculate #jump to calculate label
lowercaseCount:
add $a0,$a0,$t8 #subtracts 32 from the value stored in $a0
calculate:
beq $a0,'C',cCount #branching and checking for capital occurences for each one
beq $a0,'H',hCount
beq $a0,'A',aCount
beq $a0,'R',rCount
beq $a0,'E',eCount
beq $a0,'O',oCount
beq $a0,'G',gCount
beq $a0,'N',nCount
j exitCount
gCount:
add $t7,$t7,1 #incrementing gCount by 1
j exitCount
cCount:
add $t0,$t0,1 #Incrementing cCount by 1
j exitCount
hCount:
add $t1,$t1,1 #incrementing hCount by 1
j exitCount
aCount:
add $t2,$t2,1 #Incrementing aCount by 1
j exitCount
rCount:
add $t3,$t3,1 #incrementing rCount by 1
j exitCount
eCount:
add $t4,$t4,1 #Incrementing eCount by 1
j exitCount
oCount:
add $t5,$t5,1 #incrementing oCount by 1
j exitCount
nCount:
add $t6,$t6,1 #incrementing nCount by 1
exitCount:
j loop
done:
li $a0,'C' #checks for the uppercase letter and moves into the new register
move $a1,$t0 #and moves into the new register
jal printCount
li $a0,'H' #checks for the uppercase letter and moves into the new register
move $a1,$t1 #and moves into the new register
jal printCount
li $a0,'A' #checks for the uppercase letter and moves into the new register
move $a1,$t2 #and moves into the new register
jal printCount
li $a0,'R' #checks for the uppercase letter and moves into the new register
move $a1,$t3 #and moves into the new register
jal printCount
#li $a0,'G' #checks for the uppercase letter and moves into the new register
#move $a1,$t7 #and moves into the new register
#jal printCount
li $a0,'E' #checks for the uppercase letter and moves into the new register
move $a1,$t4 #and moves into the new register
jal printCount
li $a0,'O' #checks for the uppercase letter and moves into the new register
move $a1,$t5 #and moves into the new register
jal printCount
li $a0,'N' #checks for the uppercase letter and moves into the new register
move $a1,$t6 #and moves into the new register
jal printCount
li $a0,'G' #checks for the uppercase letter and moves into the new register
move $a1,$t7 #and moves into the new register
jal printCount
move $v0,$a0 #moves the register
li $v0,11 #prints the character
syscall
li $a0, 'C' #loads C into register
move $a1,$t0 #moves value of $t0 into a1
syscall
jal printhash #jump and link to printhash
li $a0, 'H' #loads H into register
move $a1,$t1 #moves value of $t1 into $a1
syscall
jal printhash #jump n link to printhash
li $a0, 'A' #loads A into register
move $a1,$t2 #move the register from $t2 into $a1
syscall
jal printhash
li $a0, 'R' #loads R into register
move $a1,$t3 #move the register from $t3 into $a1
syscall
jal printhash #jumps to printhash
li $a0,'E' #loads E into register
move $a1,$t4 #move the register from $t4 into $a1
syscall
jal printhash #jumps to printhash
li $a0, 'O' #loads O into register
move $a1,$t5 #move the register from $t5 into $a1
syscall
jal printhash #jumps to print hash
li $a0,'N' #loads N into register
move $a1,$t6 #move the register from $t6 into $a1
syscall
jal printhash #jumps to printhash
li $a0, 'G' #loads G into register
move $a1,$t7 #move the register from $t7 into $a1
syscall
jal printhash #jumps to printhash
li $v0,10 #syscall to terminate the program once this loop has been executed
syscall
printCount:
move $v0,$a0 #prints the character
li $v0,11
syscall
li $a0,':' #prints the character
li $v0,11
syscall
move $a0,$a1 #prints the current count
li $v0,1
syscall
li $a0,'\n' #prints the newline
li $v0,11
syscall
jr $ra
printhash:
#move $v0,$a0 #prints the character
#li $v0,11
#syscall
li $a0,':' #prints the character
li $v0,11
syscall
move $a0,$a1 #prints the current count
li $s7,0 #indexing for the loop
hash:
bge $s7,$a1,exithash #loop condition branch to exit loop if equal
li $a0,'#' #loads # into the register
syscall
addi $s7,$s7,1 #adding 1 to the value in the register $s7
j hash #jumping back to the start of the loop
exithash: #label of exit loop
li $a0,'\n' #loading new line
li $v0,11 #printing the new line
syscall #executing syscal
jr $ra #jumping back to register $t1
您有：
beq .... lowercaseCount
j calculate
lowercaseCount:
...
calculate:
此 beq 分支围绕单个跳转指令。那可以优化去掉跳转，如下：分支代替计算，条件相反！
bne calculate
...
calculate:
此外，您有 j exitCount 并且确实有 j loop。
这是一个无条件分支到另一个无条件分支，可以优化。将所有 j exit 替换为 j loop 以跳过不必要的跃点。