backend.h

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#pragma once
 
#include <simd/attributes.h>
#include <simd/vec.h>
#include <simd/integer.h>
 
#include <cstddef>
#include <type_traits>
 
namespace everett::backend_detail {
  // These are compile-time instruction profiles, not CPU feature probes.
  // Every architecture-independent wire representation keeps the same layout.
  template <simd::architecture Arch> inline constexpr std::size_t register_bytes =
    std::is_same_v<Arch, simd::avx512> ? 64 :
    std::is_same_v<Arch, simd::avx2> ? 32 :
    std::is_same_v<Arch, simd::neon> ? 16 : 1;
}