No description
5200e04e92
Although the cache models support wider accesses, the ISA descriptions assume that (for the most part) memory operands are integer types, which makes it difficult to define instructions that do memory accesses larger than 64 bits. This patch adds some generic support for memory operands that are arrays of uint64_t, and specifically a 'u2qw' operand type for x86 that is an array of 2 uint64_ts (128 bits). This support is unused at this point, but will be needed shortly for cmpxchg16b. Ideally the 128-bit SSE memory accesses will also be rewritten to use this support. Support for 128-bit accesses could also have been added using the gcc __int128_t extension, which would have been less disruptive. However, although clang also supports __int128_t, it's still non-standard. Also, more importantly, this approach creates a path to defining 256- and 512-byte operands as well, which will be useful for eventual AVX support. |
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| configs | ||
| ext | ||
| src | ||
| system | ||
| tests | ||
| util | ||
| .hgignore | ||
| .hgtags | ||
| COPYING | ||
| LICENSE | ||
| README | ||
| SConstruct | ||
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.