[Mesa-dev] llvmpipe support for ARM?

[Roland Scheidegger]

That's good to know. I've always thought it's a bit of a pity that it
isn't optimized at all for arm (doesn't use any arm intrinsics, though
with newer llvm versions it is probably not all that important any more,
and I'm not even sure which neon intrinsics would be useful) but someone
would need to do the work. But that it's running is a good start :-).

Roland

Am 15.04.2015 um 17:45 schrieb Jan Vesely:
> 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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