[Bug 31246] Reproducible hangs on piglit tests with 5850

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https://bugs.freedesktop.org/show_bug.cgi?id=31246

--- Comment #1 from Ian Romanick <idr@xxxxxxxxxxxxxxx> 2010-11-02 10:28:39 PDT ---
There was a time when the i965 driver would also hang in at least some of these
tests.  You might look at how Eric solved it there.  Search the GIT log for
those test names.

In all of these cases the problem is that the driver emitted some sequence of
instructions that made the GPU angry.  For example, I'll bet that the GPU
doesn't like a return instruction that doesn't have a preceding call
instruction.  We implemented a lowering pass to remove returns from main to fix
this very problem on i965 for glsl-[fv]s-main-return.

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