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The uint_fast16_t is the integer at least 16 bits size, it can be 32, 64 bits and more. Usually most of the simulations are in the x86-64 linux host, the size of uint_fast16_t is 64 bits. Therefore, there is no problem for double precision float operations and it can pass FloatMM test. However, in the Mac OS, the size of uint_fast16_t is 16 bits, it will lose the upper bits when converting float register bits to freg_t and it will generate unexpected results for FloatMM test. The change can guarantee that the size of data in freg_t is at least 64 bits and it will not lose any data from floating point to freg_t. Reference: https://developer.apple.com/documentation/kernel/uint_fast16_t https://codebrowser.dev/glibc/glibc/stdlib/stdint.h.html Change-Id: I3df6610f0903cdee0f56584d6cbdb51ac26c86c8 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/71519 Maintainer: Bobby Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
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, 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 these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - 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 may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.