About assembly : Why-does-the-compiler-reserve-a-little-stack-space-but-not-the-whole-array-size

Question Detail

The following code

int main() {
int arr[120];
return arr[0];
}

Compiles into this:

sub rsp, 360
mov eax, DWORD PTR [rsp-480]
add rsp, 360
ret

Knowing the ints are 4 bytes and the array is size 120, the array should take 480 bytes, but only 360 bytes are subtracted from ESP… Why is this?

Question Answer

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