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Re: [PATCH]: Fix PR tree-optimization/19038
On Fri, 2005-01-21 at 15:25 -0500, Diego Novillo wrote:
> Daniel Berlin wrote:
> > loop-im would have hoisted it if it was profitable, and then we'd have
> > copy-proped that version in dom3.
> OK, so it's what I thought. We create a dependency on code hoisting.
> Not a big problem, I guess, but the comment is misleading.
> Rather say something like: Do not propagate copies, if the propagated
> value is at a deeper loop depth. This may move loop variant variables
> outside of their loops and prevent coalescing opportunities. If the
> value was loop invariant, it will be hoisted by LICM and exposed for
> copy propagation.
Okay with that change?