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In most ISAs except MIPS and Power, this was implemented as inst->advancePC(). It works just fine to call this function all the time, but the idea had originally been that for ISAs which could simply advance the PC using the PC itself, they could save the virtual function call. Since the only ISAs which could skip the call were MIPS and Power, and neither is at the point where that level of performance tuning matters, this function can be collapsed with little downside. If this turns out to be a performance bottleneck in the future, the way the PC is managed could be revisited to see if we can factor out this trip to the instruction object in the first place. Change-Id: I533d1ad316e5c936466c529b7f1238a9ab87bd1c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39335 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-by: Alex Dutu <alexandru.dutu@amd.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, 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.