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crypto/subtle: improve xorBytes assembler on PPC64
This makes some improvements to the xorBytes assembler implementation for PPC64 targets. The loops to process large streams of bytes has been changed to do 64 bytes at a time. Other changes were made to prevent degradations in some of the common sizes like 8, 16. The case for < 8 bytes on power10 has been modified to use the LXVL and STXVL instructions. Change-Id: I7477d12d5375d484af8c274443d595ccdafbda7c Reviewed-on: https://go-review.googlesource.com/c/go/+/530877 Reviewed-by: Paul Murphy <[email protected]> TryBot-Result: Gopher Robot <[email protected]> Reviewed-by: Jayanth Krishnamurthy <[email protected]> LUCI-TryBot-Result: Go LUCI <[email protected]> Reviewed-by: Michael Pratt <[email protected]> Reviewed-by: Benny Siegert <[email protected]> Run-TryBot: Lynn Boger <[email protected]>
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