栈帧管理对 C++ 函数调用性能的影响

#include <iostream>
#include <chrono>

using namespace std;

// 大型局部变量示例
struct LargeStruct {
    int data[100000];
};

// 嵌套函数调用示例
void nestedCall(int depth) {
    if (depth > 0) {
        nestedCall(depth - 1);
    }
}

int main() {
    // 测量栈帧大小对函数调用的影响
    int iterations = 1000000;
    auto start = chrono::high_resolution_clock::now();

    for (int i = 0; i < iterations; i++) {
        LargeStruct largeObj;  // 创建大型局部变量
    }

    auto end = chrono::high_resolution_clock::now();
    auto largeObjDuration = chrono::duration_cast<chrono::milliseconds>(end - start);

    start = chrono::high_resolution_clock::now();

    for (int i = 0; i < iterations; i++) {
        nestedCall(100);  // 执行深度函数调用
    }

    end = chrono::high_resolution_clock::now();
    auto nestedCallDuration = chrono::duration_cast<chrono::milliseconds>(end - start);

    cout << "Large object allocation: " << largeObjDuration.count() << " ms" << endl;
    cout << "Nested function calls: " << nestedCallDuration.count() << " ms" << endl;

    return 0;
}