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opt_vector_float() transforms several scalar MOV operations to a single vectorial MOV. This is done when those MOV covers all the components of the destination register. So something like: mov vgrf3.0.xy:D, 0D mov vgrf3.0.w:D, 1065353216D mov vgrf3.0.z:D, 0D is transformed in: mov vgrf3.0:F, [0F, 0F, 0F, 1F] But there are cases where not all the components are written. For example, in: mov vgrf2.0.x:D, 1073741824D mov vgrf3.0.xy:D, 0D mov vgrf3.0.w:D, 1065353216D mov vgrf4.0.xy:D, 1065353216D mov vgrf4.0.w:D, 0D mov vgrf6.0:UD, u4.xyzw:UD Nor vgrf3 nor vgrf4 .z components are written, so the optimization is not applied. But it could be applied anyway with the components covered, using a writemask to select the ones written. So we could transform it in: mov vgrf2.0.x:D, 1073741824D mov vgrf3.0.xyw:F, [0F, 0F, 0F, 1F] mov vgrf4.0.xyw:F, [1F, 1F, 0F, 0F] mov vgrf6.0:UD, u4.xyzw:UD This commit does precisely that: opportunistically apply opt_vector_float() when possible. total instructions in shared programs: 7124660 -> 7114784 (-0.14%) instructions in affected programs: 443078 -> 433202 (-2.23%) helped: 4998 HURT: 0 total cycles in shared programs: 64757760 -> 64728016 (-0.05%) cycles in affected programs: 1401686 -> 1371942 (-2.12%) helped: 3243 HURT: 38 v2: change vectorize_mov() signature (Matt). v3: take in account predicates (Juan). v4 [mattst88]: Update shader-db numbers. Fix some whitespace issues. Reviewed-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
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.