[Bug rtl-optimization/52714] [4.7/4.8/4.9 regression] ICE in fixup_reorder_chain, at cfglayout.c:880

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52714

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |law at redhat dot com
           Assignee|unassigned at gcc dot gnu.org      |law at redhat dot com

--- Comment #12 from Jeffrey A. Law <law at redhat dot com> ---
So the problem here is try_combine is playing things a bit fast and loose when
it rips apart the PARALLEL into two independent sets (one of which is a nop). 
In particular it assumes that I3 is an INSN as opposed to a JUMP_INSN or
CALL_INSN.  As a result combine is happy to create the bogus RTL as seen in
Andreas's last comment.

It's easily fixed and a patch for that is in testing.