804ec72c68
This patch adds functions for encoding and emitting compressed riscv (RVC) instructions to the BPF JIT. Some regular riscv instructions can be compressed into an RVC instruction if the instruction fields meet some requirements. For example, "add rd, rs1, rs2" can be compressed into "c.add rd, rs2" when rd == rs1. To make using RVC encodings simpler, this patch also adds helper functions that selectively emit either a regular instruction or a compressed instruction if possible. For example, emit_add will produce a "c.add" if possible and regular "add" otherwise. Signed-off-by: Luke Nelson <luke.r.nels@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200721025241.8077-3-luke.r.nels@gmail.com
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.