[S390x] Optimize Chacha20 with fat build support
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 |