Compiler Loop Unswitching

Hi,

I'd like to know your experiences with compiler loop optimizations.

What loop optimizations (in your opinion) can be applied to a large
number of programs and yield a (significant) improvement of the
program run-time?

I've tested the compiler optimization "loop unswitching" (also introduced
in gcc 3.4) but going through a large number of different benchmarks I
could find very few examples where the optimization could be applied. Do
you share my experience?

Regards,
Tim

.

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