[Bug rtl-optimization/63448] [4.9/5 Regression] ICE when compiling atlas 3.10.2

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63448

--- Comment #8 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
I already saw such problem.  It is chain of spills and reassignment of
non-reload pseudos.  Each pass considers only 1-2 pseudos and very few insns. 
We just need 2 more passes to finish RA for the test.  The current code of LRA
looping prevention is too conservative for the case.

Finally I have an idea how to solve this kind of problems.  The patch is on the
way.