19daf0aef8
When an ALU instruction is preceded by a MOV instruction that just moves a source register into the destination register of the ALU, replace that MOV+ALU instructions by an ALU operation taking the source of the MOV as second source instead of using its destination. Before the change, code could look like the following, with superfluous separate register move (mr) instructions. 70: 7f c6 f3 78 mr r6,r30 74: 7f a5 eb 78 mr r5,r29 78: 30 c6 ff f4 addic r6,r6,-12 7c: 7c a5 01 d4 addme r5,r5 With this commit, addition instructions take r30 and r29 directly. 70: 30 de ff f4 addic r6,r30,-12 74: 7c bd 01 d4 addme r5,r29 Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b6719beaf01f9dcbcdbb787ef67c4a2f8e3a4cb6.1675245773.git.christophe.leroy@csgroup.eu
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.