Repository: tesseract-ocr/tesseract
File: src/arch/simddetect.cpp (C++)

Code before:
#      if defined(HAVE_AVX2)
      if (max_function_id >= 7) {
        __cpuid(cpuInfo, 7);
        avx2_available_ = (cpuInfo[1] & 0x00000020) != 0;
        avx512F_available_ = (cpuInfo[1] & 0x00010000) != 0;
        avx512BW_available_ = (cpuInfo[1] & 0x40000000) != 0;
      }
#      endif
    }
#    endif
  }
#  else
#    error "I don't know how to test for SIMD with this compiler"
#  endif
#endif

#if defined(HAVE_NEON) && !defined(__aarch64__)
#  if HAVE_ANDROID_GETCPUFAMILY
  {
    AndroidCpuFamily family = android_getCpuFamily();
    if (family == ANDROID_CPU_FAMILY_ARM)
      neon_available_ = (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON);
  }
#  elif HAVE_GETAUXVAL
  neon_available_ = getauxval(AT_HWCAP) & HWCAP_NEON;
#  elif HAVE_ELF_AUX_INFO
  unsigned long hwcap = 0;
  elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
  neon_available_ = hwcap & HWCAP_NEON;
#  endif
#endif

  // Select code for calculation of dot product based on autodetection.
  if (false) {
    // This is a dummy to support conditional compilation.
#if defined(HAVE_AVX2)
  } else if (avx2_available_) {
    // AVX2 detected.
    SetDotProduct(DotProductAVX, &IntSimdMatrix::intSimdMatrixAVX2);
#endif
#if defined(HAVE_AVX)
  } else if (avx_available_) {
    // AVX detected.
    SetDotProduct(DotProductAVX, &IntSimdMatrix::intSimdMatrixSSE);
#endif
#if defined(HAVE_SSE4_1)
  } else if (sse_available_) {
    // SSE detected.
    SetDotProduct(DotProductSSE, &IntSimdMatrix::intSimdMatrixSSE);
#endif
#if defined(HAVE_NEON) || defined(__aarch64__)

Review comment (suggestion):
```suggestion
#  elif defined(HAVE_ELF_AUX_INFO)
```

Code after:
#      if defined(HAVE_AVX2)
      if (max_function_id >= 7) {
        __cpuid(cpuInfo, 7);
        avx2_available_ = (cpuInfo[1] & 0x00000020) != 0;
        avx512F_available_ = (cpuInfo[1] & 0x00010000) != 0;
        avx512BW_available_ = (cpuInfo[1] & 0x40000000) != 0;
      }
#      endif
    }
#    endif
  }
#  else
#    error "I don't know how to test for SIMD with this compiler"
#  endif
#endif

#if defined(HAVE_NEON) && !defined(__aarch64__)
#  if defined(HAVE_ANDROID_GETCPUFAMILY)
  {
    AndroidCpuFamily family = android_getCpuFamily();
    if (family == ANDROID_CPU_FAMILY_ARM)
      neon_available_ = (android_getCpuFeatures() & ANDROID_CPU_ARM_FEATURE_NEON);
  }
#  elif defined(HAVE_GETAUXVAL)
  neon_available_ = getauxval(AT_HWCAP) & HWCAP_NEON;
#  elif defined(HAVE_ELF_AUX_INFO)
  unsigned long hwcap = 0;
  elf_aux_info(AT_HWCAP, &hwcap, sizeof hwcap);
  neon_available_ = hwcap & HWCAP_NEON;
#  endif
#endif

  // Select code for calculation of dot product based on autodetection.
  if (false) {
    // This is a dummy to support conditional compilation.
#if defined(HAVE_AVX2)
  } else if (avx2_available_) {
    // AVX2 detected.
    SetDotProduct(DotProductAVX, &IntSimdMatrix::intSimdMatrixAVX2);
#endif
#if defined(HAVE_AVX)
  } else if (avx_available_) {
    // AVX detected.
    SetDotProduct(DotProductAVX, &IntSimdMatrix::intSimdMatrixSSE);
#endif
#if defined(HAVE_SSE4_1)
  } else if (sse_available_) {
    // SSE detected.
    SetDotProduct(DotProductSSE, &IntSimdMatrix::intSimdMatrixSSE);
#endif
#if defined(HAVE_NEON) || defined(__aarch64__)