https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90271
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-04-28
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
memcpy optimization happens only when expanding from Gimple to RTL and we don't
remove "stack" locations after RTL.
I Have some idea on how to solve this. Use VCE to convert to the same size
integer (if it exists) and then use BIT_FIELD_REF to extract the value, note we
to deal with big vs little endian (as BIT_FIELD_REF is depdent on that).
