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2717e01fc3
Decrease the amount of code specific to the different AES variants by "right-aligning" the sequence of round keys, and for AES-128 and AES-192 just skipping irrelevant rounds at the beginning. This shrinks the size of aes-xts-avx-x86_64.o by 13.3%, and it improves the efficiency of AES-128 and AES-192. The tradeoff is that for AES-256 some additional not-taken conditional jumps are now executed. But these are predicted well and are cheap on x86. Note that the ARMv8 CE based AES-XTS implementation uses a similar strategy to handle the different AES variants. Signed-off-by: Eric Biggers <ebiggers@google.com> 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 reStructuredText 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.