https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67698
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
I checked a fix:
commit c6d616512b2bc429f43c147dcd5cb0c27af8aa47
Author: H.J. Lu <hjl.to...@gmail.com>
Date: Thu Sep 24 05:23:37 2015 -0700
Remove interrupt_return
We must pass UNSPEC_INTERRUPT_RETURN parallel pattern directly to
emit_jump_insn to emit IRET instruction. We don't need to mark
BP and SP registers used by interrupt return since it is emitted
via emit_jump_insn now.
into hjl/interrupt/master branch.
