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The isZeroReg() helper checked if the register was both an integer register, and if it equaled TheISA::ZeroReg. This bakes in both the assumption that any zero registers are integer (and that integer registers are a thing), and also internalizes the plumbing which selects what index is the zero register. This change eliminates the isZeroReg helper and moves the logic inside it into where it was called. In most cases, it was actually not necessary to check if the register was integer since that was already implied by context. This also brings the TheISA::ZeroReg constant out, where it can be replaced by values plumbed in more generally than a fixed, ISA specific constant. Change-Id: I651762b6eb01fea83ec0b0076e8be9bf24b5b0da Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42683 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, 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.