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Because the semantics of source modifiers are type-dependent, the type of the original source of the copy must be kept unmodified while propagating it into some instruction, which implies that we need to have the guarantee that the meaning of the instruction is going to remain the same after we have changed the types. Whenthe size of the new type is different from the size of the old type the new and old instructions cannot possibly be equivalent because the new instruction will be reading more data than the old one was. Prevents that we turn this: load_payload(8) vgrf17:DF, |vgrf4+0.0|:DF 1sthalf mov(8) vgrf18:DF, vgrf17:DF 1sthalf load_payload(8) vgrf5:DF, vgrf18:DF, vgrf20:DF NoMask 1sthalf WE_all load_payload(8) vgrf21:UD, vgrf5+0.4<2>:UD 1sthalf mov(8) vgrf22:UD, vgrf21:UD 1sthalf into: load_payload(8) vgrf17:DF, |vgrf4+0.0|:DF 1sthalf mov(8) vgrf18:DF, |vgrf4+0.0|:DF 1sthalf load_payload(8) vgrf5:DF, |vgrf4+0.0|:DF, |vgrf4+2.0|:DF NoMask 1sthalf WE_all load_payload(8) vgrf21:UD, vgrf5+0.4<2>:UD 1sthalf mov(8) vgrf22:DF, |vgrf4+0.4|<2>:DF 1sthalf where the semantics of the last instruccion have changed. v2 (Curro): - Update commit log and add comment to explain the problem better. - Simplify the condition. Reviewed-by: Francisco Jerez <currojerez@riseup.net> 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.