[Bug 31635] New: Bad performance of 64-bit compilation compared to 32-bit.

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31635

           Summary: Bad performance of 64-bit compilation compared to
                    32-bit.
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: drill87@gmail.com


I've got archlinux 64-bit system with chrooted archlinux 32-bit in it. 
Video card: ATI X1270 (RS690)
Kernel version: 2.6.35
Xorg server version: 1.9.0

I've compiled r300g both for 32-bit and 64-bit systems with parameters:
  --prefix=/usr --enable-glx-tls --disable-egl --enable-gallium-radeon
--with-dri-driverdir=/usr/lib/xorg/modules/dri --with-dri-drivers="radeon,r300"
--with-state-trackers="glx,dri"

After tests I found, that in 32-bit r300g gives 860 fps in glxgears, whereas
64-bit version only 250. I also compared framerate in 3D action game Tremulous,
which has precompiled binaries for both 32-bit and 64-bit linux - the result
was similar: I've got 38 fps in 32-bit version and only 18 fps in 64-bit in
same scene.

Unfortunately, I'm not sure if this is a real bug or just a bad optimization of
64-bit version - I couldn't find any specific information about that...

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