Kenneth Graunke
60a17d0718
Previously, opt_vector_float() always interpreted MOV sources as floating point, and always created a MOV with a F-type destination. This meant that we could mess up sequences of integer loads, such as: mov vgrf6.0.x:D, 0D mov vgrf6.0.y:D, 1D mov vgrf6.0.z:D, 2D mov vgrf6.0.w:D, 3D Here, integer 0/1/2/3 become approximately 0.0f, so we generated: mov vgrf6.0:F, [0F, 0F, 0F, 0F] which is clearly wrong. We can properly handle this by converting integer values to float (rather than bitcasting), and emitting a type converting MOV: mov vgrf6.0:D, [0F, 1F, 2F, 3F] To do this, see first see if the integer values (converted to float) are representable. If so, we use a D-type MOV. If not, we then try the floating point values and an F-type MOV. We make zero not impose type restrictions. This is important because 0D would imply a D-type MOV, but is often used in sequences such as MOV 0D, MOV 0x3f800000D, where we want to use an F-type MOV. Fixes about 54 dEQP-GLES2 failures with the vec4 VS backend. This recently became visible due to changes in opt_vector_float() which made it optimize more cases, but it was a pre-existing bug. Apparently it also manages to turn more integer loads into VFs, producing the following shader-db statistics on Haswell: total instructions in shared programs: 7084195 -> 7082191 (-0.03%) instructions in affected programs: 246027 -> 244023 (-0.81%) helped: 1937 total cycles in shared programs: 65669642 -> 65651968 (-0.03%) cycles in affected programs: 531064 -> 513390 (-3.33%) helped: 1177 v2: Handle the type of zero better. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Iago Toral Quiroga <itoral@igalia.com> Reviewed-by: Matt Turner <mattst88@gmail.com>
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.