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Some shaders include code that looks like: uniform int i; uniform vec4 bones[...]; foo(bones[i * 3], bones[i * 3 + 1], bones[i * 3 + 2]); CSE would do some work on this: x = i * 3 foo(bones[x], bones[x + 1], bones[x + 2]); The compiler may then add '<< 4 + base' to the index calculations. This results in expressions like x = i * 3 foo(bones[x << 4], bones[(x + 1) << 4], bones[(x + 2) << 4]); Just rearranging the math to produce (i * 48) + 16 saves an instruction, and it allows CSE to do more work. x = i * 48; foo(bones[x], bones[x + 16], bones[x + 32]); So, ~6 instructions becomes ~3. Some individual shader-db results look pretty bad. However, I have a really, really hard time believing the change in estimated cycles in, for example, 3dmmes-taiji/51.shader_test after looking that change in the generated code. G45 total instructions in shared programs: 4020840 -> 4010070 (-0.27%) instructions in affected programs: 177460 -> 166690 (-6.07%) helped: 894 HURT: 0 total cycles in shared programs: 98829000 -> 98784990 (-0.04%) cycles in affected programs: 3936648 -> 3892638 (-1.12%) helped: 894 HURT: 0 Ironlake total instructions in shared programs: 6418887 -> 6408117 (-0.17%) instructions in affected programs: 177460 -> 166690 (-6.07%) helped: 894 HURT: 0 total cycles in shared programs: 143504542 -> 143460532 (-0.03%) cycles in affected programs: 3936648 -> 3892638 (-1.12%) helped: 894 HURT: 0 Sandy Bridge total instructions in shared programs: 8357887 -> 8339251 (-0.22%) instructions in affected programs: 432715 -> 414079 (-4.31%) helped: 2795 HURT: 0 total cycles in shared programs: 118284184 -> 118207412 (-0.06%) cycles in affected programs: 6114626 -> 6037854 (-1.26%) helped: 2478 HURT: 317 Ivy Bridge total instructions in shared programs: 7669390 -> 7653822 (-0.20%) instructions in affected programs: 388234 -> 372666 (-4.01%) helped: 2795 HURT: 0 total cycles in shared programs: 68381982 -> 68263684 (-0.17%) cycles in affected programs: 1972658 -> 1854360 (-6.00%) helped: 2458 HURT: 307 Haswell total instructions in shared programs: 7082636 -> 7067068 (-0.22%) instructions in affected programs: 388234 -> 372666 (-4.01%) helped: 2795 HURT: 0 total cycles in shared programs: 68282020 -> 68164158 (-0.17%) cycles in affected programs: 1891820 -> 1773958 (-6.23%) helped: 2459 HURT: 261 Broadwell total instructions in shared programs: 9002466 -> 8985875 (-0.18%) instructions in affected programs: 658784 -> 642193 (-2.52%) helped: 2795 HURT: 5 total cycles in shared programs: 78503092 -> 78450404 (-0.07%) cycles in affected programs: 2873304 -> 2820616 (-1.83%) helped: 2275 HURT: 415 Skylake total instructions in shared programs: 9156978 -> 9140387 (-0.18%) instructions in affected programs: 682625 -> 666034 (-2.43%) helped: 2795 HURT: 5 total cycles in shared programs: 75591392 -> 75550574 (-0.05%) cycles in affected programs: 3192120 -> 3151302 (-1.28%) helped: 2271 HURT: 425 Signed-off-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Thomas Helland <thomashelland90@gmail.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> |
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| docs | ||
| doxygen | ||
| include | ||
| m4 | ||
| scons | ||
| scripts | ||
| src | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
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.