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[Bug rtl-optimization/52714] [4.7/4.8/4.9 regression] ICE in fixup_reorder_chain, at cfglayout.c:880
- From: "law at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 06 Feb 2014 21:08:22 +0000
- Subject: [Bug rtl-optimization/52714] [4.7/4.8/4.9 regression] ICE in fixup_reorder_chain, at cfglayout.c:880
- Auto-submitted: auto-generated
- References: <bug-52714-4 at http dot gcc dot gnu dot org/bugzilla/>
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.