[Bug 87103] Compilation is *very* slow.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87103

--- Comment #4 from Gonz <gonzhauser at yahoo.de> ---
I also tested on latest git; the problem persists.

>From callgrind_annotate:

324,681,210,134 
../src/mesa/mesa/src/mesa/drivers/dri/i965/brw_fs_live_variables.cpp:brw::fs_live_variables::compute_live_variables()
[../src/mesa/mesa/lib/i965_dri.so]
 30,407,730,617 
../src/mesa/mesa/src/mesa/drivers/dri/i965/brw_fs_live_variables.cpp:brw::fs_live_variables::compute_start_end()
[../src/mesa/mesa/lib/i965_dri.so]
 27,294,134,491 
../src/mesa/mesa/src/util/register_allocate.c:ra_add_node_adjacency
[../src/mesa/mesa/lib/i965_dri.so]
 16,474,809,991 
../src/mesa/mesa/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp:fs_visitor::assign_regs(bool)
[../src/mesa/mesa/lib/i965_dri.so]

The compilation itself takes minutes, not the execution of the resulting
shader.

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