[Mesa-dev] [Bug 27512] Illegal instruction _mesa_x86_64_transform_points4_general

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27512

--- Comment #17 from Timothy Arceri <t_arceri at yahoo.com.au> ---
(In reply to Michael Harder from comment #15)
> It worked for a few days but now I get this:
> 
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
> Core was generated by `/usr/lib/x86_64-linux-gnu/kodi/kodi.bin --standalone'.
> Program terminated with signal SIGILL, Illegal instruction.
> #0  _mesa_x86_64_transform_points4_general () at x86-64/xform4.S:72
> 72              prefetcht1 16(%rdx)
> [Current thread is 1 (Thread 0x7fd24af779c0 (LWP 797))]

I ran into this problem with my new old hardware I've been playing with
recently.

The problem can be reproduced running a number of piglit tests such as:

./bin/fbo-stencil readpixels GL_DEPTH24_STENCIL8 -auto -fbo


The patch doesn't fix the problem as it seems prefetcht1 doesn't like offsets.
If I change for example prefetcht1 16(%rdx) -> prefetcht1 (%rdx) removing the
offset for all instances the piglit will now pass. Not sure how to work around
this problem.

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