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The TGSI DCE pass doesn't eliminate dead assignments like MOV TEMP[0], TEMP[1] in presence of loops because it assumes that the visitor doesn't emit dead code. This assumption is actually wrong and this situation happens. However, it appears that the merge_registers() pass accidentally takes care of this for some weird reasons. But since this pass has been disabled for RadeonSI and Nouveau, the renumber_registers() pass which is called *after*, can't do its job correctly. This is because it assumes that no dead code is present. But if there is still a dead assignment, it might re-use the TEMP register id incorrectly and emits wrong code. This patches fixes the issue by recording writes instead of reads, and this has the advantage to be faster. This should fix Unigine Heaven on RadeonSI and Nouveau. shader-db results with RadeonSI: 47109 shaders in 29632 tests Totals: SGPRS: 1923308 -> 1923316 (0.00 %) VGPRS: 1133843 -> 1133847 (0.00 %) Spilled SGPRs: 2516 -> 2518 (0.08 %) Spilled VGPRs: 65 -> 65 (0.00 %) Private memory VGPRs: 1184 -> 1184 (0.00 %) Scratch size: 1308 -> 1308 (0.00 %) dwords per thread Code Size: 60095968 -> 60096256 (0.00 %) bytes LDS: 1077 -> 1077 (0.00 %) blocks Max Waves: 431889 -> 431889 (0.00 %) Wait states: 0 -> 0 (0.00 %) It's still interesting to disable the merge_registers() pass. Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.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 https://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.