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FROM_DOUBLE opcodes are setup so that they use a dst register with a size of 2 even if they only produce a single-precison result (this is so that the opcode can use the larger register to produce a 64-bit aligned intermediary result as required by the hardware during the conversion process). This creates a problem for spilling though, because when we attempt to emit a spill for the dst we see a 32-bit destination and emit a scratch write that allocates a single spill register, making the intermediary writes go beyond the size of the allocation. Prevent this by avoiding to spill the destination register of these opcodes. Alternatively, we can avoid this by splitting the opcode in two: one that produces a 64-bit aligned result and one that takes the 64-bit aligned result as input and produces a 32-bit result from it. 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.