[Bug middle-end/82556] [7/8 Regression] internal compiler error in curr_insn_transform, at lra-constraints.c:4307

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82556

--- Comment #4 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> Confirmed on the branch (for the unreduced testcase).  GCC 7.2 works.
> 
> Probably Jakubs pattern changes.

It is an unusual pattern for LRA.  I guess it should be fixed in LRA.  I'll
investigate the problem and try to find a fix in LRA.