On Mon, Aug 12, 2019 at 01:59:09AM +0300, Ard Biesheuvel wrote:
> This series resubmits the aegis128 SIMD patches that were reverted due to
> the fact that the compiler's optimization behavior wrt variables with static
> linkage does not turn out to guarantee that function calls that are
> conditional on the value of such a variable are optimized away if the value
> is a compile time constant and the condition evaluates to false at compile
> time as well.
>
> Changes since v1:
> - minor tweaks to #2 to drop a memset() invocation from the decrypt path,
> and some temp vars in various places
> - update the NEON code in #3 so it builds with Clang as well as GCC (and
> drop the RFC annotation)
>
> Patch #1 reintroduces the changes to the generic code to permit SIMD
> routines to be attached to the aegis128 driver. This time, the conditional
> check is pulled into a helper function which collapses to 'return false'
> if the CONFIG_CRYPTO_AEGIS128_SIMD Kconfig symbol is not set. (This has
> been confirmed by one of the reporters of the original issue as sufficient
> to address the problem).
>
> Patch #2 is mostly unchanged wrt the version that got reverted, only some
> inline annotations were added back.
>
> Patch #3 is new and implements the SIMD routines for arm64 without using
> the optional AES instructions, but using plain SIMD arithmetic instead.
> This is much slower than AES instructions, but still substantially more
> efficient than table based scalar AES on systems where memory accesses are
> expensive, such as the Raspberry Pi 3 (which does not implement the AES
> instructions)
>
> Ard Biesheuvel (3):
> crypto: aegis128 - add support for SIMD acceleration
> crypto: aegis128 - provide a SIMD implementation based on NEON
> intrinsics
> crypto: arm64/aegis128 - implement plain NEON version
>
> crypto/Kconfig | 5 +
> crypto/Makefile | 20 ++
> crypto/{aegis128.c => aegis128-core.c} | 52 ++++-
> crypto/aegis128-neon-inner.c | 212 ++++++++++++++++++++
> crypto/aegis128-neon.c | 49 +++++
> 5 files changed, 334 insertions(+), 4 deletions(-)
> rename crypto/{aegis128.c => aegis128-core.c} (89%)
> create mode 100644 crypto/aegis128-neon-inner.c
> create mode 100644 crypto/aegis128-neon.c
All applied. Thanks.
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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