7367bfeb2c
This implements 5-way interleaving for ECB, CBC decryption and CTR, resulting in a speedup of ~11% on Marvell ThunderX2, which has a very deep pipeline and therefore a high issue latency for NEON instructions operating on the same registers. Note that XTS is left alone: implementing 5-way interleave there would either involve spilling of the calculated tweaks to the stack, or recalculating them after the encryption operation, and doing either of those would most likely penalize low end cores. For ECB, this is not a concern at all, given that we have plenty of spare registers. For CTR and CBC decryption, we take advantage of the fact that v16 is not used by the CE version of the code (which is the only one targeted by the optimization), and so we can reshuffle the code a bit and avoid having to spill to memory (with the exception of one extra reload in the CBC routine) Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.