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{
  "commit": "ffda3774fd1cbb9a95ef18394fc44f30d5effc86",
  "tree": "31f931167481b13c53ad96fd498b2c2f5d3977eb",
  "parents": [
    "8ab2bba6486cf16c17bce92a061c5c3dbf5c2cc9"
  ],
  "author": {
    "name": "PENGBIN",
    "email": "pengbin@kingsoft.com",
    "time": "Mon Feb 26 17:36:37 2018 +0800"
  },
  "committer": {
    "name": "Zoe Liu",
    "email": "zoeliu@google.com",
    "time": "Wed Feb 28 20:42:40 2018 +0000"
  },
  "message": "Add SSE4_2 version of crc hash function\n\n1. Add SSE4_2 detection to rtcd\n2. Add av1_get_crc_value_sse4_2 and unittest AV1CrcHashTest\n3. av1_get_crc_value_sse4_2 is crc32, which is longer than the C version\nSo, the hash result of sse4_2 and C is not the same, but should be\nbitwise identical for the encoder result.\n4. The speed test in AV1CrcHashTest shows SSE4_2 version is 10x ~ 50x\nfaster than C version.\nhash  64x64 :1906883.00/75701.00ns(25.19)\nhash  32x32 :922948.00/38389.00ns(24.04)\nhash   8x8  :234861.00/4615.00ns(50.89)\nhash   4x4  :107561.00/9238.00ns(11.64)\n5. For encoder, about 2% faster shows by encoding 20 frames foreman_cif.y4m.\n\nChange-Id: I1d3272cdb94733ac55a0f9affbb1faac3fdc78d1\n",
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