https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67288
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |amker at gcc dot gnu.org
--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But the RTL loop optimizers just notice that the BIV has a step of 16 and
divides the expression, I think we can't expect those passes to be able to use
combine-like simplifications.81082
Another possibility is, if it is easy to predict what loops would be very
likely candidates for doloop if the target supports them force for them in
IVOPTS an IV with step of 1 (or -1), rather than some other step (and use that
IV solely for the loop condition), plus use a IV with the other step if needed;
with the expectation that doloop optimizes such IVs away completely and just
uses the initial value for initializing the loop counter.
