[Bug rtl-optimization/61094] [4.9/4.10 Regression] -O3 insn Internal compiler error in copyprop_hardreg_forward_1, at regcprop.c:775

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61094

--- Comment #9 from Jeffrey A. Law <law at redhat dot com> ---
Just starting to look at this, but my first thought is to validate the copy in
combine_set_extension.  We can still abort the transformation at that point.