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Re: [tree-ssa] Loop header copying on trees
> >> + ftree-ch
> >> + Common
> >> + Enable loop header copying on trees
> >> +
> >Include a small blurb describing why header copying is beneficial.
> >Also, do we really want to control it with a flag? Some of the -f flags
> >we have in tree-ssa should probably disappear.
> And in fact, I don't think we really want to have a knob to turn off
> header copying.
why not? At the very least, we probably do not want it enabled at -Os.
Also I do not see why having a precise control over what the compiler
does should be wrong.