Python 如何在 MIPS 中正确使用 mod 运算符？
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How do I correctly use the mod operator in MIPS?
提问by kcmallard
In MIPS, I am confused on how to get the mod to work. Below is the code I have come up with thus far. I may have more errors besides the mod, but I feel those errors are a result of the mod misunderstanding. All I'm trying to do is to get the working code (python) here:
在 MIPS 中，我对如何让 mod 工作感到困惑。下面是我到目前为止想出的代码。除了mod之外我可能还有更多错误，但我觉得这些错误是mod误解的结果。我要做的就是在此处获取工作代码（python）：
i = 1
k = 0
while i < 9:
if i % 2 != 0:
k = k + i
i += 1
print(k)
to be correctly translated into MIPS. This is my first shot at assembly, so there may be more than mod errors that are tripping me up in the code below:
正确转换为 MIPS。这是我第一次尝试组装，所以在下面的代码中可能有比 mod 错误更多的错误：
# Takes the odd integers from 1 to 9, adds them,
# and spits out the result.
# main/driver starts here
.globl main
main:
#data segment
.data
Li: .byte 0x01 # i = 1
Lj: .byte 0x09 # j = 9
Lk: .byte 0x00 # k = 0
Ltwo: .byte 0x02 # 2 for mod usage
# text segment
.text
lb $t0, Li # temp reg for i
lb $t1, Lj # j
lb $t2, Lk # k
lb $t3, Ltwo # 2
L1: beq $t0, $t1, L2 # while i < 9, compute
div $t0, $t3 # i mod 2
mfhi $t6 # temp for the mod
beq $t6, 0, Lmod # if mod == 0, jump over to L1
add $t2, $t2, $t0 # k = k + i
Lmod: add $t0, $t0, 1 # i++
j L1 # repeat the while loop
L2: li $v0, 1 # system call code to print integer
lb $a0, Lk # address of int to print
syscall
li $v0, 10
syscall
采纳答案by Michael Foukarakis
You are viewing SPIM registers in hex. Hexadecimal 10 is decimal 16.
您正在查看十六进制的 SPIM 寄存器。十六进制 10 是十进制 16。
回答by kcmallard
After working out the kinks, the below code works like a charm. To correctly use the mod operator in MIPS, one must utilize HI and LO. I needed i % 2 == 0 for the statement, so mfhi came in handy. Reference below code for working results:
解决这些问题后，下面的代码就像一个魅力。要在 MIPS 中正确使用 mod 运算符，必须使用 HI 和 LO。我需要 i % 2 == 0 来声明，所以 mfhi 派上用场了。工作结果参考以下代码：
# Takes the odd integers from 1 to 9, adds them,
# and spits out the result.
# main/driver starts here
.globl main
main:
#data segment
.data
Li: .byte 0x01 # i = 1
Lj: .byte 0x0A # j = 10
Lk: .byte 0x00 # k = 0
Ltwo: .byte 0x02 # 2 for mod usage
# text segment
.text
lb $t0, Li # temp reg for i
lb $t1, Lj # j
lb $t2, Lk # k
lb $t3, Ltwo # 2
L1: beq $t0, $t1, L2 # while i < 9, compute
div $t0, $t3 # i mod 2
mfhi $t6 # temp for the mod
beq $t6, 0, Lmod # if mod == 0, jump over to Lmod and increment
add $t2, $t2, $t0 # k = k + i
Lmod: add $t0, $t0, 1 # i++
j L1 # repeat the while loop
L2: li $v0, 1 # system call code to print integer
move $a0, $t2 # move integer to be printed into $a0
syscall
li $v0, 10 # close the program
syscall
