Francisco Jerez
4d1959e693
This addresses a long-standing back-end compiler bug that could lead to cross-channel data corruption in loops executed non-uniformly. In some cases live variables extending through a loop divergence point (e.g. a non-uniform break) into a convergence point (e.g. the end of the loop) wouldn't be considered live along all physical control flow paths the SIMD thread could possibly have taken in between due to some channels remaining in the loop for additional iterations. This patch fixes the problem by extending the CFG with physical edges that don't exist in the idealized non-vectorized program, but represent valid control flow paths the SIMD EU may take due to the divergence of logical threads. This makes sense because the i965 IR is explicitly SIMD, and it's not uncommon for instructions to have an influence on neighboring channels (e.g. a force_writemask_all header setup), so the behavior of the SIMD thread as a whole needs to be considered. No changes in shader-db. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see https://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.