[Dev] A patch to speed up extract speed on ARM64

3 Dec 2023

      Hi RAR developers:

Here is a patch to improve ARM64 extract speed on ARM64 platform via crc instructions.
If the ARM64 support CRC extension, the CRC32 algorism will be optimized as below:
      b4:   8b020022        add     x2, x1, x2
      b8:   38401423        ldrb    w3, [x1], #1
      bc:   1ac34000        crc32b  w0, w0, w3
After this change, the extract speed has 10% improvements.
Please revew the patch enclosed.

Any feedback would be appreciated.

Chenxi

[Dev] A patch to speed up extract speed on ARM64

Chenxi Mao