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These had been templated on a type, and then the width of that type was considered the amount the PC should advance when executing straight line code. That type was MachInst, which was loosely the size of an instruction, but was practically whatever sized data type was fed into the decoder at a time. Instead of tying this to a type, this change moves it over to be a simple number. This avoids a level of indirection, and also further decouples the type the decoder might use as input from the instruction size. Change-Id: I797876a33d27e759c7a6e23a658179201fabfa47 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40176 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
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, SWIG, 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 the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - 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 will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.