Experimental dig at cross platform SIMD

incomplete_dig_at_cross_platform_simd.cpp

template <typename T> class Simd;

#if defined(TC_ARCH_X86)
#include <bits/stdc++.h>
#include <x86intrin.h>

uint16_t simdSize = 128;

uint16_t detectSimdSize() {
  if (__builtin_cpu_supports("avx512f")) {
    return 512;
  } else if (__builtin_cpu_supports("avx")) {
    return 256;
  } else {
    return 128;
  }
}

void initializeSimd() { simdSize = detectSimdSize(); }

template <typename T> class Register {
public:
  typedef union {
    T data __attribute__((vector_size(16)));
    T data256 __attribute__((vector_size(32)));
    T data512 __attribute__((vector_size(64)));
  } Type;
  Type data;

  explicit Register(T &val) {
    if (simdSize == 512) {
      data.data512 = val;
    } else if (simdSize == 256) {
      data.data256 = val;
    } else {
      data.data = val;
    }
  }

  Register(T *val) {
    if (simdSize == 512) {
      __mm512_loadu_si512(&data.data512, val);
      data.data512 = *val;
    } else if (simdSize == 256) {
      data.data256 = *val;
    } else {
      data.data = *val;
    }
  }

  static uint16_t size() { return simdSize / (sizeof(T) * 8); }
};
#endif