[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 #14 from Jeffrey A. Law <law at redhat dot com> ---
I'm not talking about restricting the general case where we've got cascaded
extensions.  Just the case where one of the insns in the cascade has a
source/dest that are not the same register.  Which is a case we didn't even try
to optimize until 4.9.