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/**
@file      simd_avx512bw.cpp
@brief     RE/flex SIMD intrinsics compiled with -mavx512bw
@author    Robert van Engelen - engelen@genivia.com
@copyright (c) 2016-2022, Robert van Engelen, Genivia Inc. All rights reserved.
@copyright (c) BSD-3 License - see LICENSE.txt
*/

#include <reflex/absmatcher.h>

namespace reflex {

// Partially count newlines in string b up to and including position e in b, updates b close to e with uncounted part
size_t simd_nlcount_avx512bw(const char*& b, const char *e)
{
  const char *s = b;
  size_t n = 0;
#if defined(HAVE_AVX512BW) && (!defined(_MSC_VER) || defined(_WIN64))
  __m512i vlcn = _mm512_set1_epi8('\n');
  while (s + 63 <= e)
  {
    __m512i vlcm = _mm512_loadu_si512(reinterpret_cast<const __m512i*>(s));
    uint64_t mask = _mm512_cmpeq_epi8_mask(vlcm, vlcn);
    n += popcountl(mask);
    s += 64;
  }
#else
  (void)e;
#endif
  b = s;
  return n;
}

} // namespace reflex
