------- Comment #3 from bonzini at gnu dot org 2009-02-16 09:56 ------- Subject: Re: [meta-bug] ivopts metabug
> I'm adding PR 34163 in the hope that ivopts pass will someday know how to > handle x[n] = f (x[n-1]) from "... very tight loops that calculate x[n] from > the value x[n-1], where x[n-1] is the result of a previous step." > > This is especially important for unrolled loops, see PR 34163, comment #8 Isn't what you want simply load PRE? That looks like a pass ordering problem... -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39201
