Francisco Jerez
7ceb42ccc5
This uses the unblocked time of the exit assigned to each available node to attempt to unblock exit nodes as early as possible, potentially reducing the runtime of the shader when an exit branch is taken. There is a natural trade-off between terminating the program as early as possible and reducing the worst-case latency of the program as a whole (since this will typically move exit-unblocking nodes closer to its dependencies potentially causing additional stalls of the execution pipeline), but in practice the bandwidth and ALU cycle savings from terminating the program earlier tend to outweigh the slight increase in worst-case program execution latency, so it makes sense to prefer nodes likely to unblock an earlier exit regardless of the latency benefits of other available nodes. I haven't observed any benchmark regressions from this change after testing on VLV, HSW, BDW, BSW and SKL. The FPS of the GfxBench Manhattan benchmark increases by 10%-20% and the FPS of Unigine Valley improves by roughly 5% depending on the platform and settings. The change to the register pressure-sensitive heuristic is rather conservative and gives precedence to the existing heuristic in order to avoid increasing register pressure and causing spill count and SIMD width regressions in shader-db. It may make sense to revisit this with additional performance data. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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.