Carlos Eduardo Seo
20be4c3c3e
Add asm implementation for chacha20 using vector instructions on ppc64le. Below, the difference using the new code: name old speed new speed delta ChaCha20/32-16 167MB/s ± 0% 129MB/s ± 0% -22.60% (p=0.008 n=5+5) ChaCha20/63-16 308MB/s ± 0% 249MB/s ± 0% -19.00% (p=0.008 n=5+5) ChaCha20/64-16 357MB/s ± 0% 251MB/s ± 0% -29.57% (p=0.008 n=5+5) ChaCha20/256-16 398MB/s ± 0% 1199MB/s ± 0% +201.20% (p=0.008 n=5+5) ChaCha20/1024-16 413MB/s ± 0% 1398MB/s ± 0% +238.67% (p=0.008 n=5+5) ChaCha20/1350-16 395MB/s ± 0% 1189MB/s ± 0% +200.71% (p=0.008 n=5+5) ChaCha20/65536-16 420MB/s ± 0% 1489MB/s ± 0% +254.10% (p=0.008 n=5+5) Small sizes are slower due the fact that it always calculates using 256 bytes of key stream. This change was originally from Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com> and started as CL 108999 (https://go-review.googlesource.com/c/crypto/+/108999). Fixes golang/go#25051 Change-Id: Ie510494249b227379e23d993467256b3d4088035 Reviewed-on: https://go-review.googlesource.com/c/crypto/+/172177 Run-TryBot: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>