[Bug target/63805] ICE: in extract_insn, at recog.c:2327 with -mcpu=power8

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63805

Alan Modra <amodra at gmail dot com> changed:

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                 CC|                            |amodra at gmail dot com

--- Comment #12 from Alan Modra <amodra at gmail dot com> ---
The problem with the both the original testcase and the one in comment #4 is
that a 16-byte atomic access is being attempted on an object that is not
16-byte aligned.  I'm not sure if that makes the code invalid, or whether it
means that powerpc64 should use a locking implementation, but mis-aligned
16-byte atomic loads are not supported by the hardware.