[PATCH v4] aarch64: thunderx2 memcpy optimizations for ext-based code path

[Anton Youdkevitch]

Wilco,

I appreciate you comments very much. Here is the patch
considering the points you made.

1. Always taken conditional branch at the beginning is
removed.

2. Epilogue code is placed after the end of the loop to
reduce the number of branches.

3. The redundant "mov" instructions inside the loop are
gone due to the changed order of the registers in the ext
instructions inside the loop.

4. Invariant code in the loop epilogue is no more
repeated for each ext chunk.

make check shows no regression

-- 
   Thanks,
   Anton


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