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We add support for the matrix registers to the Arm architecture. This will be used to implement support for Arm's Scalable Matrix Extension (SME) in subsequent commits. We add an implementation of a matrix register for the Arm architecture. These are akin to 2D vector registers in the sense that they can be dynamically viewed as a variety of element sizes. As widening the element size would reduce the matrix size by a factor of element size, we instead layer multiple tiles of wider elements onto the underlying matrix storage in order to retain square matrices. We separate the storage of the matrix from the different views one can have. The potential views are: * Tiles: View the matrix as one or more tiles using a specified element size. As the element size increases the number of indexable tiles increases. When using the smallest granularity element size (bytes) there is a single tile. As an example, using 32-bit elements yields 4 tiles. Tiles are interleaved onto the underlaying matrix modulo element size. A tile supports 2D indexing ([][]), with the first index specifying the row index, and the second the column (element index within the row). * A Horizontal/Vertical slice (row or a column) of a tile: Take the aforementioned tile, and extract a specified row or column slice from it. A slice supports standard []-based indexing. A tile slice must use the same underlying element type as is used for the tile. * A Horizontal/Vertical slice (row or column) of the underlying matrix storage: Treat the matrix register as an array of vectors (rows or columns, rows preferred due to them being indepependent of the element size being used). On simulator start-up the matrix registers are initialised to a maximum size. At run-time the used size can by dynamically adjusted. However, please note that as the matrix register class doesn't know if a smaller size is being used, the class itself doesn't do any bounds checking itself. This is left to the user. Jira Issue: https://gem5.atlassian.net/browse/GEM5-1289 Change-Id: I6a6a05154846e4802e9822bbbac00ab2c39538ed Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/64334 Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.