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The hardware only supports 32-bit swizzles, which means that we can only access directly channels XY of a DF making access to channels ZW more difficult, specially considering the various regioning restrictions imposed by the hardware. The combination of both things makes handling ramdom swizzles on DF operands rather difficult, as there are many combinations that can't be represented at all, at least not without some work and some level of instruction splitting depending on the case. Writemasks are 64-bit in general, however XY and ZW writemasks also work in 32-bit, which means these writemasks can't be represented natively, adding to the complexity. For now, we decided to try and simplify things as much as possible to avoid dealing with all this from the get go by adding a scalarization pass that runs after the main optimization loop. By fully scalarizing DF instructions in align16 we avoid most of the complexity introduced by the aforementioned hardware restrictions and we have an easier path to an initial fully functional version for the vector backend in Haswell and IvyBridge. Later, we can improve the implementation so we don't necessarily scalarize everything, iteratively adding more complexity and building on top of a framework that is already working. Curro drafted some ideas for how this could be done here: https://bugs.freedesktop.org/show_bug.cgi?id=92760#c82 v2: - Use a copy constructor for the scalar instructions so we copy all relevant instructions fields from the original instruction. v3: Fix indention in one switch (Matt) Reviewed-by: Matt Turner <mattst88@gmail.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.