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llvm has _huge_ problems trying to load things like <4 x i8> vectors and stitching such loads together to form 128bit vectors. My understanding of the problem is that the type legalizer tries to extend that to really a <4 x i32> vector and not a <16 x i8> vector with the 4 elements first then followed by padding, so the shuffles for then combining things together are more or less impossible - you can in fact see the pmovzxd llvm generates. Pre-4.0 llvm just gives up on it completely and does a 30+ pextrb/pinsrb sequence instead. It looks like current llvm has fixed this behavior (my guess would be due to better shuffle combination and load/shuffle folds), but we can avoid this by just loading as <1 x i32> values, combine that and only cast at the end. (I suspect it might also work if we'd pad the loaded vectors immediately before shuffling them together, instead of directly stitching 2 such vectors together pairwise before combining the pair. But this _might_ lose the ability to load the values directly into their right place in the vector with pinsrd.). But using 32bit values is probably easier for llvm as it will never give it funny ideas how the vector should look like. (This is possibly only a problem for 1x8bit formats, since 2x8bit will end up fetching 64bit hence only two vectors are stitched together, not 4, but we use the same strategy anyway.) Reviewed-by: Jose Fonseca <jfonseca@vmware.com> |
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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 http://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.