Loop unrolling-related Bench++ regressions?

[Paolo Carlini]

Roger Sayle wrote:

>Richard Henderson asked for test cases where loop unrolling fails
>where it succeeded before.  A good example comes from test L000003
>in the bench++ benchmark suite, which has recently regressed.  My
>timings show that its took 0.626 nanoseconds a week or so ago, but
>now takes 2.88 nanoseconds [over 4.5 times slower] on 1GHz pentium
>III running RedHat linux v7.2.
>
Thanks Roger!!!

Ciao, Paolo.