Eric Anholt
ab1b1fa6fb
The register allocator walks from the end of the nodes array looking for trivially-allocatable things to put on the stack, meaning (assuming everything is trivially colorable and gets put on the stack in a single pass) the low node numbers get allocated first. The things allocated first happen to get the lower-numbered registers, which is to say the fast accumulators that can be paired more easily. When we previously made the nodes match the temporary register numbers, we'd end up putting the shader inputs (VS or FS) in the accumulators, which are often long-lived values. By prioritizing the shortest-lived values for allocation, we can get a lot more instructions that involve accumulators, and thus fewer conflicts for raddr and WS. total instructions in shared programs: 52870 -> 46428 (-12.18%) instructions in affected programs: 52260 -> 45818 (-12.33%)
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. - 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.