[Bug middle-end/81596] backwards threader misses simple copy within the same BB

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81596

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

           What    |Removed                     |Added
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                 CC|                            |law at redhat dot com

--- Comment #2 from Jeffrey A. Law <law at redhat dot com> ---
Jump threading is a fairly high overhead solution for this problem.  Simple
const/copy propagation is a better solution in cases like this IMHO.

The overhead could be reduced with some changes to the updating algorithm that
I want to implement, but haven't yet.  So perhaps keep it open as a low
priority issue.