36d5e89255
Explicitly separate the way the data is represented in the underlying representation from how it's represented in the instruction. In order to make the ISA parser happy, the Mem operand needs to have a single, particular type. To handle that with scalar types, we just used uint64_ts and then worked with values that were smaller than the maximum we could hold. To work with these new array values, we also use an underlying uint64_t for each element. To make accessing the underlying memory system more natural, when we go to actually read or write values, we translate the access into an array of the actual, correct underlying type. That way we don't have non-exact asserts which confuse gcc, or weird endianness conversion which assumes that the data should be flipped 8 bytes at a time. Because the functions involved are generally inline, the syntactic niceness should all boil off, and the final implementation in the binary should be simple and efficient for the given data types. Change-Id: I14ce7a2fe0dc2cbaf6ad4a0d19f743c45ee78e26 Reviewed-on: https://gem5-review.googlesource.com/6582 Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@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/Introduction, and for more information about building the simulator and getting started please see http://www.gem5.org/Documentation and http://www.gem5.org/Tutorials. 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/Dependencies 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 ALPHA, 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/Build_System for more details and options. With the simulator built, have a look at http://www.gem5.org/Running_gem5 for more information on how to use gem5. 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. Please see the gem5 download page for these items at http://www.gem5.org/Download If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.