[Bug middle-end/59743] [4.9 Regression] ICE: Segmentation fault

law at redhat dot com gcc-bugzilla@gcc.gnu.org
Thu Jan 9 21:50:00 GMT 2014


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59743

--- Comment #4 from Jeffrey A. Law <law at redhat dot com> ---
I see what's going on.

Basically the code exhibits undefined behaviour (r.s.high is not defined before
its first use in the loop).  Thus the first and only reaching def is appearing
after the first use.

Obviously we shouldn't be faulting here.

Markus -- You might want to go back to your original test and ensure it's not
exhibiting undefined behaviour.  The original code may be exhibiting undefined
behaviour.



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