tree 31f931167481b13c53ad96fd498b2c2f5d3977eb
parent 8ab2bba6486cf16c17bce92a061c5c3dbf5c2cc9
author PENGBIN <pengbin@kingsoft.com> 1519637797 +0800
committer Zoe Liu <zoeliu@google.com> 1519850560 +0000

Add SSE4_2 version of crc hash function

1. Add SSE4_2 detection to rtcd
2. Add av1_get_crc_value_sse4_2 and unittest AV1CrcHashTest
3. av1_get_crc_value_sse4_2 is crc32, which is longer than the C version
So, the hash result of sse4_2 and C is not the same, but should be
bitwise identical for the encoder result.
4. The speed test in AV1CrcHashTest shows SSE4_2 version is 10x ~ 50x
faster than C version.
hash  64x64 :1906883.00/75701.00ns(25.19)
hash  32x32 :922948.00/38389.00ns(24.04)
hash   8x8  :234861.00/4615.00ns(50.89)
hash   4x4  :107561.00/9238.00ns(11.64)
5. For encoder, about 2% faster shows by encoding 20 frames foreman_cif.y4m.

Change-Id: I1d3272cdb94733ac55a0f9affbb1faac3fdc78d1