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Summary: The presence of this attribute indicates that VGPR outputs should be computed in whole quad mode. This will be used by Mesa for prolog pixel shaders, so that derivatives can be taken of shader inputs computed by the prolog, fixing a bug. The generated code could certainly be improved: if a prolog pixel shader is used (which isn't common in modern OpenGL - they're used for gl_Color, polygon stipples, and forcing per-sample interpolation), Mesa will use this attribute unconditionally, because it has to be conservative. So WQM may be used in the prolog when it isn't really needed, and furthermore a silly back-and-forth switch is likely to happen at the boundary between prolog and main shader parts. Fixing this is a bit involved: we'd first have to add a mechanism by which LLVM writes the WQM-related input requirements to the main shader part binary, and then Mesa specializes the prolog part accordingly. At that point, we may as well just compile a monolithic shader... Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95130 Reviewers: arsenm, tstellarAMD, mareko Subscribers: arsenm, llvm-commits, kzhuravl Differential Revision: http://reviews.llvm.org/D20839 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272063 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| README.txt | ||
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.