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From: "iverbin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/64412] [regression] ICE in offload compiler: in extract_insn, at recog.c:2327
Date: Fri, 26 Dec 2014 19:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64412

--- Comment #2 from iverbin at gcc dot gnu.org ---
(In reply to H.J. Lu from comment #1)
> (In reply to iverbin from comment #0)
> > To reproduce using Intel Xeon Phi emulation:
> > 1. Build offload and host compilers as described in
> > https://gcc.gnu.org/wiki/Offloading#How_to_try_offloading_enabled_GCC
> > 2. Run make check-target-libgomp RUNTESTFLAGS="c.exp=e.53.5.c"
> 
> Can you create a stanalone testcase for the Intel Xeon Phi offload
> cross compiler?  It will be easier to debug.

The offload model in GCC implies 2 compilers: one produces IR for OpenMP target
regions, and another compiles this IR for Intel Xeon Phi.
There is no single compiler, which could stream offload IR out, then stream it
in, and then compile.
I can reduce e.53.5.c testcase, not sure whether this is helpful.