void skip_any_simple_characters_sse42()

in src/detail/skip_chars_sse42.cpp [29:58]

• 26 lines of code
• 3 McCabe index (conditional complexity)

void skip_any_simple_characters_sse42(decode_context &context) {
  const auto end = context.end;
  auto pos = context.position;

  JSON_STRING_SKIP_N_SIMPLE(1,  2, uint8_t,  if, done_x)
  JSON_STRING_SKIP_N_SIMPLE(2,  4, uint16_t, if, done_2)
  JSON_STRING_SKIP_N_SIMPLE(4,  8, uint32_t, if, done_4)
  JSON_STRING_SKIP_N_SIMPLE(8, 16, uint64_t, if, done_8)

  {
    alignas(16) static const char CHARS[16] = "\"\\";
    const auto chars = _mm_load_si128(reinterpret_cast<const __m128i *>(&CHARS[0]));

    for (; end - pos >= 16; pos += 16) {
      const auto chunk = _mm_load_si128(reinterpret_cast<const __m128i *>(pos));
      constexpr auto flags = _SIDD_UBYTE_OPS | _SIDD_CMP_EQUAL_ANY | _SIDD_POSITIVE_POLARITY | _SIDD_LEAST_SIGNIFICANT;
      const auto index = _mm_cmpestri(chars, 2, chunk, 16, flags);
      if (index != 16) {
        context.position = pos + index;
        return;
      }
    }
  }

          JSON_STRING_SKIP_N_SIMPLE(8, x, uint64_t, while, done_8)
  done_8: JSON_STRING_SKIP_N_SIMPLE(4, x, uint32_t, while, done_4)
  done_4: JSON_STRING_SKIP_N_SIMPLE(2, x, uint16_t, while, done_2)
  done_2: JSON_STRING_SKIP_N_SIMPLE(1, x, uint8_t,  while, done_x)
  done_x: context.position = pos;
}