quickjs/quickjs-aeshash.h at main · InfiniBrains/quickjs · GitHub

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#ifndef QUICKJS_AESHASH_H
#define QUICKJS_AESHASH_H

#include <immintrin.h>
#include <stdint.h>

static inline uint32_t
aeshash8(const uint8_t* s, size_t len, uint32_t h) {
  __m128i H, S;

  H = _mm_set_epi32(0, 0, 0, h);

  /* aligned on 8-byte boundary */
  if(((size_t)s & 0x07) == 0) {
    while(len >= 8) {
      /* load 8 bytes into lower half of vector register */
      S = _mm_loadl_epi64((const __m128i*)s);
      /* zero extend unsigned 8-bit integers  to packed 16-bit integers */
      S = _mm_cvtepu8_epi16(S);
      H = _mm_aesenc_si128(S, H);
      s += 8;
      len -= 8;
    }
  } else {
    while(len >= 8) {
      /* unaligned load 8 bytes into lower half of vector register */
      S = _mm_loadu_si64((const __m128i*)s);
      /* zero extend unsigned 8-bit integers  to packed 16-bit integers */
      S = _mm_cvtepu8_epi16(S);
      H = _mm_aesenc_si128(S, H);
      s += 8;
      len -= 8;
    }
  }

  if(len > 0) {
    switch(len) {
      case 1: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, 0, 0, s[0]);
        break;
      }
      case 2: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, 0, s[1], s[0]);
        break;
      }
      case 3: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, s[2], s[1], s[0]);
        break;
      }
      case 4: {
        S = _mm_set_epi16(0, 0, 0, 0, s[3], s[2], s[1], s[0]);
        break;
      }
      case 5: {
        S = _mm_set_epi16(0, 0, 0, s[4], s[3], s[2], s[1], s[0]);
        break;
      }
      case 6: {
        S = _mm_set_epi16(0, 0, s[5], s[4], s[3], s[2], s[1], s[0]);
        break;
      }
      case 7: {
        S = _mm_set_epi16(0, s[6], s[5], s[4], s[3], s[2], s[1], s[0]);
        break;
      }
    }
    H = _mm_aesenclast_si128(S, H);
  }

  // horizontally xor the 4 32-bit parts of the 128-bit register
  return _mm_extract_epi32(H, 0) ^ _mm_extract_epi32(H, 1) ^ _mm_extract_epi32(H, 2) ^ _mm_extract_epi32(H, 3);
}

/*static inline uint32_t
aeshash8_alt(const uint8_t* s, size_t len, uint32_t h) {
  __m128i H = _mm_set_epi32(0, 0, 0, h);

  while(len >= 8) {
    H = _mm_aesenc_si128(_mm_set_epi16(s[7], s[6], s[5], s[4], s[3], s[2], s[1], s[0]), H);
    s += 8;
    len -= 8;
  }

  if(len > 0) {
    switch(len) {
      case 1: { S = _mm_set_epi16(0, 0, 0, 0, 0, 0, 0, s[0]); break; }
      case 2: { S = _mm_set_epi16(0, 0, 0, 0, 0, 0, s[1], s[0]); break; }
      case 3: { S = _mm_set_epi16(0, 0, 0, 0, 0, s[2], s[1], s[0]); break; }
      case 4: { S = _mm_set_epi16(0, 0, 0, 0, s[3], s[2], s[1], s[0]); break; }
      case 5: { S = _mm_set_epi16(0, 0, 0, s[4], s[3], s[2], s[1], s[0]); break; }
      case 6: { S = _mm_set_epi16(0, 0, s[5], s[4], s[3], s[2], s[1], s[0]); break; }
      case 7: { S = _mm_set_epi16(0, s[6], s[5], s[4], s[3], s[2], s[1], s[0]); break; }
    }
    H = _mm_aesenclast_si128(S, H);
  }

  // horizontally xor the 4 32-bit parts of the 128-bit register
  return _mm_extract_epi32(H, 0) ^ _mm_extract_epi32(H, 1) ^ _mm_extract_epi32(H, 2) ^ _mm_extract_epi32(H, 3);
}*/

static inline uint32_t
aeshash16(const uint16_t* s, size_t len, uint32_t h) {
  __m128i H, S;

  H = _mm_set_epi32(0, 0, 0, h);

  /* aligned on 16-byte boundary */
  if(((size_t)s & 0x0f) == 0) {
    while(len >= 8) {
      /* load 8 shorts into vector register */
      S = _mm_load_si128((const __m128i*)s);
      H = _mm_aesenc_si128(S, H);
      s += 8;
      len -= 8;
    }
  } else {
    while(len >= 8) {
      /* load 8 unaligned shorts into vector register */
      S = _mm_lddqu_si128((const __m128i*)s);
      H = _mm_aesenc_si128(S, H);
      s += 8;
      len -= 8;
    }
  }

  if(len > 0) {
    switch(len) {
      case 1: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, 0, 0, s[0]);
        break;
      }
      case 2: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, 0, s[1], s[0]);
        break;
      }
      case 3: {
        S = _mm_set_epi16(0, 0, 0, 0, 0, s[2], s[1], s[0]);
        break;
      }
      case 4: {
        S = _mm_set_epi16(0, 0, 0, 0, s[3], s[2], s[1], s[0]);
        break;
      }
      case 5: {
        S = _mm_set_epi16(0, 0, 0, s[4], s[3], s[2], s[1], s[0]);
        break;
      }
      case 6: {
        S = _mm_set_epi16(0, 0, s[5], s[4], s[3], s[2], s[1], s[0]);
        break;
      }
      case 7: {
        S = _mm_set_epi16(0, s[6], s[5], s[4], s[3], s[2], s[1], s[0]);
        break;
      }
    }
    H = _mm_aesenclast_si128(S, H);
  }

  // horizontally xor the 4 32-bit parts of the 128-bit register
  return _mm_extract_epi32(H, 0) ^ _mm_extract_epi32(H, 1) ^ _mm_extract_epi32(H, 2) ^ _mm_extract_epi32(H, 3);
}

#endif