https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99956
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |amker at gcc dot gnu.org
Keywords| |missed-optimization
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
prepare_perfect_loop_nest fails doing compute_access_strides and I wonder if
we should do prepare_data_references data-ref analysis with respect to the
BBs containing loop and only after collecting all datarefs instantiate
the access fns up to the outermost loop possible.
I don't remember exactly how we deal with this but it looks like
compute_access_stride doesn't look at the access function as computed by
dataref analysis but instead it analyzes things itself and could in theory
instantiate_scev one-loop-at-a-time communicating "failure" upwards?
