http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58826
--- Comment #2 from Yuri Rumyantsev <ysrumyan at gmail dot com> --- In fact LRA is responsible for this failure - there is a bug in constant regeneration. LRA correctly regenerates all occurrences of virtual register which is not allocated(i.e. it does not has a register) but it must delete its spill/reload since this virtual register is dead.
