[Bug 98455] UnrealEngine v4 demos startup (CS compilation) never finishes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98455

--- Comment #3 from Eero Tamminen <eero.t.tamminen at intel.com> ---
VehicleGame demo also uses CS, and also freezes at startup, also with today's
Mesa git version.

One minute period of perf recording shows process 100% CPU usage being split
like this (i.e. it's compiling compute shader forever, like with others):

# Overhead  Command          Shared Object    Symbol
# ........  ...............  .......................
37.66%  i965_dri.so   ra_add_node_adjacency
18.93%  i965_dri.so   ra_allocate
 8.14%  i965_dri.so   brw::fs_live_variables::compute_start_end
 7.46%  i965_dri.so   fs_visitor::virtual_grf_interferes
 6.75%  i965_dri.so   decrement_q.isra.2
 5.40%  i965_dri.so   fs_visitor::assign_regs
 4.77%  i965_dri.so   ra_add_node_interference
 1.80%  libc-2.23.so  __memcpy_sse2
 1.74%  i965_dri.so   brw::fs_live_variables::compute_live_variables
 1.21%  libc-2.23.so  _int_malloc
 0.69%  libc-2.23.so  realloc

Some of the other UnrealEngine v4 demos have also few compute shaders, this
issue happens only with the ones where Mesa outputs this warning:
Unsupported form of variable indexing in CS; falling back to very inefficient
code generation

(Freeze doesn't happen in CSDof test which also outputs that warning couple of
times, though.)

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