https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98581
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|unknown |11.0
Last reconfirmed| |2021-01-07
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Target| |aarch64
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
There's nothing invalid here and I guess you are simply "unlucky" (or have
bougs expectations). This looks like a "perfect" opportunity for a pre-expand
pattern match to a direct internal fn corresponding to this instruction
which can look at the whole addition chain (short of integrating this matching
into the late reassoc pass).