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CircularQueue provides iterators which make it easier for users to interact with it and helps abstract its internal state, but at the same time it prevents standard algorithms like std::copy from recognizing opportunities to use bulk copies to speed up execution. It also hides the seams when wrapping around the buffer happens which std::copy wouldn't know how to handle. CircleBuf seems to be intended as a simpler type which doesn't hold complex entries like the CircularQueue does, and instead just acts as a wrap around buffer, like the name suggests. This change reimplements it to not use CircularQueue, and to instead use an underlying vector. The way internal indexing is handled CircularQueue was simplified recently, and using the same scheme here means that this code is actually not much more verbose than it was before. It also intrinsically handles indexing and bulk accesses, and uses std::copy_n in a way that lets it recognize and take advantage of contiguous storage and bulk copies. Change-Id: I78e7cfe174c52f60c95c81e5cd3d71c6052d4d41 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/38896 Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br> Maintainer: Gabe Black <gabe.black@gmail.com> Maintainer: Andreas Sandberg <andreas.sandberg@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, 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.