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The SME (Scalable Matrix Extension) [1] exposes a new matrix register ZA with variable sizes. It also exposes a new mode called streaming mode. Similarly to SVE, the ZA register size is dictated by a vector length, but the SME vector length is called streaming vetor length. The total size for ZA in a given moment is svl x svl. In streaming mode, the SVE registers have their sizes based on svl rather than the regular vector length (vl). The feature detection is controlled by the HWCAP2_SME bit, but actual support should be validated by attempting a ptrace call for one of the new register sets: NT_ARM_ZA and NT_ARM_SSVE. Due to its large size, the ZA register is exposed as a vector of bytes, but we introduce a number of pseudo-registers that gives various different views into the ZA contents. These can be arranged in a couple categories: tiles and tile slices. Tiles are matrices the same size or smaller than ZA. Tile slices are vectors which map to ZA's rows/columns in different ways. A new dynamic target description is provided containing the ZA register, the SVG register and the SVCR register. The size of ZA, like the SVE vector registers, is based on the vector length register SVG (VG for SVE). This patch enables SME register support for gdb. [1] https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/scalable-matrix-extension-armv9-a-architecture Co-Authored-By: Ezra Sitorus <ezra.sitorus@arm.com> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.