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[S390x] Optimize Chacha20 with fat build support

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Merged Maamoun TK requested to merge mamonet/nettle:s390x-chacha into master Jan 18, 2022
  • Overview 3
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  • Changes 7

This patch optimizes Chacha20 for s390x architecture by following the approach used in powerpc implementation.

testsuite passes all tests of this patch.

Benchmark of chacha encrypt/decrypt using nettle-benchmark on z15

C This patch
384.13 Mbyte/s 1478.10 Mbyte/s
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Source branch: s390x-chacha