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Previously we made the basic block following an ENDIF instruction a successor of the basic blocks ending with IF and ELSE. The PRM says that IF and ELSE instructions jump *to* the ENDIF, rather than over it. This should be immaterial to dataflow analysis, except for if, break, endif sequences: START B1 <-B0 <-B9 0x00000100: cmp.g.f0(8) null g15<8,8,1>F g4<0,1,0>F 0x00000110: (+f0) if(8) 0 0 null 0x00000000UD END B1 ->B2 ->B4 START B2 <-B1 break 0x00000120: break(8) 0 0 null 0D END B2 ->B10 START B3 0x00000130: endif(8) 2 null 0x00000002UD END B3 ->B4 The ENDIF block would have no parents, so dataflow analysis would generate incorrect results, preventing copy propagation from eliminating some instructions. This patch changes the CFG to make ENDIF start rather than end basic blocks, so that it can be the jump target of the IF and ELSE instructions. It helps three programs (including two fs8/fs16 pairs). total instructions in shared programs: 1561126 -> 1561060 (-0.00%) instructions in affected programs: 837 -> 771 (-7.89%) More importantly, it allows copy propagation to handle more cases. Disabling the register_coalesce() pass before this patch hurts 58 programs, while afterward it only hurts 11 programs. Reviewed-by: Eric Anholt <eric@anholt.net> |
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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 osmesa mesagdi to build classic mesa Windows GDI drivers; or 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. 1) install python 2.7 2) install scons (latest) 3) install mingw, flex, and bison 4) install libxml2 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get libxml2-python-2.9.1.win-amd64-py2.7.exe 5) install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe 6) install git 7) download mesa from git see http://www.mesa3d.org/repository.html 8) 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.