https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90773
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-06-07
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. Note that both the unaligned load and the unaligned store may
have issues with preceeding stores or following loads and store-to-load
forwarding. I'm not sure the speculative forwarding of aligned parts
will be retired successfully because of the aliased unaligned parts, even
if they have the same value.
But definitely an improvement for -Os.
Probably needs some target tuning knobs if implemented in the middle-end
block-copy machinery.
