[Mesa-dev] llvmpipe support for ARM?

[Marko Moberg]

Thanks for the replies.

I tried to upgrade LLVM from 3.3 to 3.4 after I sent the e-mail but ended
up having "an internal compiler error" from gcc linaro toolchain compiler.
Nice. I could try a more up-to-date version of Mesa to see if it helps.
Although I have learned that I can not take the most up-to-date version
since something has gotten broken related to SW rendering/wayland/egl.

Marko



On Wed, Apr 15, 2015 at 6:45 PM, Jan Vesely <jan.vesely at rutgers.edu> wrote:

> Hi,
> I can run arm llvmpipe glxgears on IFC6410 (Snapdragon 600 APQ8064,
> Krait 300) without problems.
> llvm 3.5
> mesa 10.4.3
> both are fedora 21 standard packages without modifications.
> I haven't tried anything more complex than glxgears
>
> jan
>
> On Wed, 2015-04-15 at 16:30 +0200, Roland Scheidegger wrote:
> > There were reports with varying success of running llvmpipe with arm in
> > the past but I haven't heard anything for a while. In theory it should
> > work (and crashing in the pixel shader is an indication the vertex
> > shader worked or at least didn't crash).
> > But it's not really tested and hence might easily break. My suggestion
> > would be to try a newer Mesa version since 9.2.5 is very old, but I
> > really don't know if it will help.
> > If that doesn't help, you could try debugging it, you can get the
> > crashing instruction in gdb with x/i <address> and see if that was an
> > unaligned access which should have been aligned or something else.
> > GALLIVM_DEBUG=ir,asm will get you the IR and compiled code (with debug
> > builds).
> >
> > Roland
> >
> >
> > Am 15.04.2015 um 14:37 schrieb Marko Moberg:
> > > Hi,
> > >
> > > I have been trying to get OpenGL sw rastering to work on Linux based
> ARM
> > > CortexA15 device but for some reason gallium llvmpipe gives me a
> > > segmentation fault. Has anybody managed to run sw rastering using
> > > gallium llvmpipe on ARM? Softpipe seems to be working ok.
> > >
> > > I am using the following versions:
> > > - Mesa 9.2.5
> > > - LLVM3.3
> > > - Wayland/Weston 1.5
> > >
> > > The issue is related to opengl/gles2 rendering i.e. weston-simple-egl
> > > demo and Qt openGL demos give seg faults when executed with llvmpipe
> > > enabled.
> > >
> > > Backtrace from weston-simple-egl looks something like this:
> > > #0  0x6d7de620 in ?? ()
> > > #1  0xb354004c in fs17_variant0_partial ()
> > > #2  0xb6841740 in lp_rast_shade_quads_mask (task=task at entry=0x1e360,
> > >     inputs=inputs at entry=0x47a00, x=128, y=80, mask=4369) at
> lp_rast.c:466
> > > #3  0xb6842d04 in do_block_4_1 (c=<optimized out>, y=<optimized out>,
> > >     x=<optimized out>, plane=<optimized out>, tri=<optimized out>,
> > >     task=<optimized out>) at lp_rast_tri_tmp.h:61
> > > #4  do_block_16_1 (c=<synthetic pointer>, y=<optimized out>,
> > >     x=<optimized out>, plane=0xb4f4ccf0, tri=<optimized out>,
> > >     task=<optimized out>) at lp_rast_tri_tmp.h:130
> > > #5  lp_rast_triangle_1 (task=0x1e360, arg=...) at lp_rast_tri_tmp.h:232
> > > #6  0xb6840420 in do_rasterize_bin (bin=<optimized out>, task=0x1e360,
> > >     x=<optimized out>, y=<optimized out>) at lp_rast.c:607
> > > #7  rasterize_bin (y=<optimized out>, x=<optimized out>, bin=<optimized
> > > out>,
> > >     task=0x1e360) at lp_rast.c:626
> > > #8  rasterize_scene (task=task at entry=0x1e360, scene=0xb3646008)
> > >     at lp_rast.c:675
> > > #9  0xb6840cb0 in thread_function (init_data=0x1e360) at lp_rast.c:788
> > > #10 0xb6d98ed2 in start_thread () from /lib/libpthread.so.0
> > > #11 0xb6c91058 in ?? () from /lib/libc.so.6
> > > #12 0xb6c91058 in ?? () from /lib/libc.so.6
> > >
> > > regards,
> > > Marko
> > >
> > > marko.s.moberg at gmail.com <mailto:marko.s.moberg at gmail.com>
> > >
> > >
> > >
> > > _______________________________________________
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> > > mesa-dev at lists.freedesktop.org
> > >
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> > >
> >
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>
> --
> Jan Vesely <jan.vesely at rutgers.edu>
>
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