SIMD and Memory Alignment

1#include <iostream>
2
3// Force 16-byte alignment for SIMD
4struct alignas(16) SimdVector {
5  float X, Y, Z, W;// 4x4 bytes = 16 bytes
6};
7
8int main() {
9  SimdVector Vec;
10  std::cout << "Vector alignment: "
11    << alignof(SimdVector) << " bytes\n"
12    << "Vector address: "
13    << &Vec << "\n"
14    << "Address divisible by 16? "
15    << (reinterpret_cast<std::uintptr_t>(&Vec)
16      % 16 == 0 ? "Yes" : "No") << "\n";
17}

1#include <iostream>
2#include <memory>
3
4struct alignas(32) SimdData {
5  float Values[8];// 8x4 = 32 bytes
6};
7
8int main() {
9// Aligned allocation
10  std::unique_ptr<SimdData> AlignedData{
11    new SimdData()};
12
13// Check alignment
14  auto Address = reinterpret_cast<std::uintptr_t>(
15    AlignedData.get());
16
17  std::cout << "Is 32-byte aligned? "
18    << (Address % 32 == 0 ? "Yes" : "No");
19}