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Previously, with HSAIL, we were guaranteed by the HSA specification that the GPU will never issue unaligned accesses. However, now that we are directly running GCN this is no longer true. Accordingly, this commit adds support for unaligned accesses. Moreover, to reduce the replication of nearly identical code for the different request types, I also added new helper functions that are called by all the different memory request producing instruction types in op_encodings.hh. Adding support for unaligned instructions requires changing the statusBitVector used to track the status of the memory requests for each lane from a bit per lane to an int per lane. This is necessary because an unaligned access may span multiple cache lines. In the worst case, each lane may span multiple cache lines. There are corresponding changes in the files that use the statusBitVector. Change-Id: I319bf2f0f644083e98ca546d2bfe68cf87a5f967 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29920 Reviewed-by: Anthony Gutierrez <anthony.gutierrez@amd.com> Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.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.