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Add x4 batched keccak implementation using MVE

Brendan Moranrequested to merge
f/keccak into master

This MR includes 6 files:

  • A symbolic assembly implementation of x4 batched keccak
  • A C harness for calling into the x4 batched keccak including a demo that runs the batched keccak with a single state, and interleave and deinterleave functions for converting between 4 individual states and the interleaved state used by the assembly code.
  • A set of load offsets and round constants used by the assembly
  • The output of SLOTHY register assignment applied to the symbolic assembly
  • The output of SLOTHY optimisation over the register-assigned assembly
  • A readme describing the code
Edited by Brendan Moran

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