XLF optimizer unreliable, inappropriate for benchmarks

[Frank Feuerbacher]

> One would hope that IBM puts its act together and fixes the optimizer.

I hope that you have called the problem in.  Problems can not be fixed unless
the person who can fix it knows about it.  Who knows (I don't), they may even
have a fix that you can try?

Disclaimer: I don't speak for my employer and they don't speak for me.