[Bug rtl-optimization/52714] [4.7/4.8/4.9 regression] ICE in fixup_reorder_chain, at cfglayout.c:880

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52714

--- Comment #13 from Jeffrey A. Law <law at redhat dot com> ---
BTW, compiling with -O2 rather than -O1 makes this problem go away.

The problematical sequence (testing that the result of an alloca call is
nonzero) is eliminated by the VRP optimizers which only run at -O2 and above.