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gcc provides __uint128_t and __int128_t types which represent 128 bit wide unsigned and signed integers, respectively. We can detect that extension and use it to perform wide multiplication which takes advantage of the built in single multiply instruction on x86 hardware without having to compute the value manually with 64 bit variables. Since both gcc and clang should support this extension and the manual version may not be exercised normally, this change also extends the gtest for intmath so that it will explicitly run the manual versions of these functions. On systems with the extension both versions will be tested, and on other systems the manual version will be harmlessly tested twice. Change-Id: I32640679396584cd43bc91a3f7e649c6e6f94afa Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42359 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
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.