--- Comment #7 from Richard Biener <rguenth at gcc dot> ---
Ok, so the issue is that SLP tree size limiting doesn't work effectively here
with the build-from-scalars fallback as the cost of doing this is not accounted
for.  The tree size itself doesn't grow too much but as we analyze depth first
and only after a lot of repeated work throwing away stuff for the
build-from-scalars fallback this is effectively a case of exponential search.

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