[Bug lto/66752] spec2000 255.vortex performance compiled with GCC is ~20% lower than with CLANG

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66752

Jeffrey A. Law <law at redhat dot com> changed:

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                 CC|                            |law at redhat dot com

--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
This is something I'd be expecting the FSM code to detect for us -- but that
code isn't firing at all due to what appears to be a relatively simple logic
error.   Hacking it up under GDB's control results in the FSM code discovering
3 threadable paths within the loop.  The net result is all the
manipulation/testing of FLAG is eliminated.

I'll be taking a deeper look over the next few days.