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It's surprising that we weren't checking for this already. A future patch will cause code like the following to be emitted: MOV(16) tmp<1>:uw, src MOV(8) dst<1>:ud, tmp<8,8,1>:ud The second MOV comes from the expansion of a LOAD_PAYLOAD header copy, so I don't have control over its types. Copy propagation will happily turn this into: MOV(8) dst<1>:ud, src Which has different semantics. Fix it by preventing propagation in cases where a single channel of the instruction would span several channels of the copy (this requirement could in fact be relaxed if the copy is just a trivial memcpy, but this case is unusual enough that I don't think it matters in practice). I'm deliberately only checking if the type of the instruction is larger than the original, because the converse case seems to be handled correctly already in the code below. Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> |
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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.