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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-01-11 16:41:52 +0000 |
|---|---|---|
| committer | Nathan Chancellor <natechancellor@gmail.com> | 2018-04-12 00:28:06 -0700 |
| commit | 78a938457536652177f6a8455c6133a3d407c80d (patch) | |
| tree | 99c02eff9a2e0da424ef99592207baf7276087a5 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | c17ad7c7c66afdc20b55580b49ace8c32e20343a (diff) | |
BACKPORT: crypto: arm64/aes - add scalar implementation
This adds a scalar implementation of AES, based on the precomputed tables
that are exposed by the generic AES code. Since rotates are cheap on arm64,
this implementation only uses the 4 core tables (of 1 KB each), and avoids
the prerotated ones, reducing the D-cache footprint by 75%.
On Cortex-A57, this code manages 13.0 cycles per byte, which is ~34% faster
than the generic C code. (Note that this is still >13x slower than the code
that uses the optional ARMv8 Crypto Extensions, which manages <1 cycles per
byte.)
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit bed593c0e852f5c1efd3ca4e984fd744c51cf6ee)
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
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