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Summary: For AMDGPU, we have been using the operating system component of the triple for specifying the low-level runtime that is being used. The rationale for this is that the host operating system (e.g. Linux) is irrelevant for GPU code, since its execution enviroment will be mostly controled by the low-level runtime being used to execute the code. In most cases, higher level languages have their own runtime which is implemented on top of the low-level runtime. The kernel ABIs of each language mostly depend on the low-level runtime, but there may be some slight differences between languages. OpenCL for example, may append additional arguments to the kernel in order to pass values like global offsets or buffers for printf. OpenMP, HCC, or other languages may want to add their own values which differ from OpenCL. The reason for adding a new opencl environment type is to make it possible for the backend to distinguish between the ABIs of the higher-level languages and handle them correctly. It seems cleaner to use the enviroment component for this rather than creating a new OS type for every combination of low-level runtime / high-level language. Reviewers: Anastasia, chandlerc Subscribers: whchung, pekka.jaaskelainen, wdng, yaxunl, llvm-commits Differential Revision: https://reviews.llvm.org/D24735 llvm-svn: 282218
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.