On Fri, Jun 18, 2021 at 2:23 PM Richard Biener <rguent...@suse.de> wrote: > > This places two hacks to avoid an old compile-time issue when > vectorizing large permuted SLP groups with gaps where we end up > emitting loads and IV adjustments for the gap as well and those > have quite a high cost until they are eventually cleaned up. > > The first hack is to fold the auto-inc style IV updates early > in the vectorizer rather than in the next forwprop pass which > shortens the SSA use-def chains of the used IV. > > The second hack is to remove the unused loads after we've picked > all that we possibly use. > > Bootstrap / regtest running on x86_64-unknown-linux-gnu. > > I wonder if this is too gross (and I have to check the one or two > bug duplicates), but it should be at least easy to backport ...
Was apparently too simple - the following passes bootstrap and regtest. Richard.
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