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In GCN3, the v_add_u32, v_sub_u32, and v_subrev_u32 instructions write the carry-out value to VCC. VEGA introduces explicit carry-out versions of these instructions (v_add_co_u32, v_sub_co_u32, and v_subrev_co_u32), and modifies the behavior of the baseline, non-carry-out versions to not write to VCC. Previously both the carry-out and non-carry-out versions shared a single implementation that wrote to VCC. This patch correctly implements the non-carry-out versions to avoid the VCC write. This patch also makes the following substitutions for GCN3 instructions that no longer exist in VEGA (this renaming has no functional impact): v_addc_u32 -> v_addc_co_u32 v_subb_u32 -> v_subb_co_u32 v_subbrev_u32 -> v_subbrev_co_u32 Change-Id: I002fa6e9316d38fd4cc3554daff047523cfc12c9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47240 Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com> Maintainer: Matt Sinclair <mattdsinclair@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.