https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96275
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2020-07-22
Blocks| |53947
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
niter analysis does not provide sth like nonzero bits so the vectorizer tries
to derive this on its own but from the niter expression, not by looking
at dominating conditions.
IMHO it belongs in niter analysis (but there the difficulty is with
latch vs. header executions we track).
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
