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svn:author
V 6
luporl
K 8
svn:date
V 27
2020-01-15T20:25:52.667182Z
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svn:log
V 617
[PPC64] memcpy/memmove/bcopy optimization

For copies shorter than 512 bytes, the data is copied using plain
ld/std instructions.
For 512 bytes or more, the copy is done in 3 phases:

Phase 1: copy from the src buffer until it's aligned at a 16-byte boundary
Phase 2: copy as many aligned 64-byte blocks from the src buffer as possible
Phase 3: copy the remaining data, if any

In phase 2, this code uses VSX instructions when available. Otherwise,
it uses ldx/stdx.

Submitted by:	Luis Pires <lffpires_ruabrasil.org> (original version)
Reviewed by:	jhibbits
Differential Revision:	https://reviews.freebsd.org/D15118

END