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Re-upload of https://gem5-review.googlesource.com/c/public/gem5/+/41214 This provides a layer of indirection where the rounding mode setting/getting code will do nothing if fenv.h isn't available. At build time, if fenv.h can't be found, a warning is printed. Also, the include for fenv.h was guarded in the includes in the ISA header, but the functions from it weren't guarded in the actual code. Finally, the code was setting the rounding mode, but not setting it back. That would mean running these instructions would set the rounding mode in gem5 as a whole, affecting its other behaviors and any other instructions that might expect the default rounding mode. Change-Id: I3ff2b97189487579554aae890e14889bd63461d2 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44085 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.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.