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Because MediaOps have two sizes, one for sources and one for destinations, it does not have a single dataSize member to set the size of its operands. This was difficult to correct at the time, so a dataSize member was created which was fixed at 0, and the instructions themselves would use srcSize and destSize internally to do the actual computation. That causes problems when tracing, since the printReg function needs to know what size to use to print some registers properly, specifically integer registers. To now fix that problem, some SFINAE constructors have been added which will either pass through a dataSize member if one exists, or pass through a pointer to the instruction itself so that operand index selector class can pick out the member that makes sense for it (destSize for DestOp, srcSize for Src1Op and Src2Op). Change-Id: I6b8259a5ab27f809b81453bcf987cc6d1be4811a Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49203 Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Gabe Black <gabe.black@gmail.com> Reviewed-by: Matt Sinclair <mattdsinclair@gmail.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.