[英]C++ to MIPS assembly
if i transfer this code to mips. 如果我将此代码转移到mips。
int arr[3];
cin>>arr[0];
cin>>arr[1];
arr[1]+=arr[0];
cin>>arr[2];
arr[2]+=arr[1];
if i have value of arr[0] in $t0 ,arr[1] in $t1 and address of the arr in $s0. 如果我在$ t0中有arr [0]的值,在$ t1中有arr [1]的值,而在$ s0中有arr的地址。
in this line 在这条线
arr[1]+=arr[0];
what i should do from this ? 我应该怎么做呢? use $t1 and $t0 direct like this 像这样直接使用$ t1和$ t0
add $t1,$t1,$t0
or i should get the value again from the memory in a registers and do the add instruction like this: 或者我应该再次从寄存器的内存中获取值,并执行如下add指令:
lw $s1,($S0)
lw $s2,4($S0)
add $s2,$s2,$s1
what the compiler do ? 编译器做什么?
There is no need to get the values from the addresses again if you have properly loaded the values into $t0
and $t1
. 如果已将值正确加载到$t0
和$t1
则无需再次从地址中获取值。
Compilers are very complex and what a compiler produces depends on many things, like optimization as Tilo mentioned. 编译器非常复杂,编译器生成的内容取决于很多事情,例如Tilo提到的优化。 The best way to see is to compile it yourself and look at the code produced. 最好的查看方法是自己编译并查看生成的代码。
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