[Bug 83658] Loop unrolling doesn't take into account whether it will decrease or increase performance

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83658

--- Comment #1 from Tapani Pälli <lemody at gmail.com> ---
FWIW there exists code to detect expressions that are constant within a loop
(during loop analysis), I think this could be used as starting point for such
optimization.

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