https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80689
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |x86_64-*-*
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
That you use noinline tells that glibc memcpy has the very same issue. Note
that similarly having bytes/shorts in the structure and using longs or ints
to implement inlined memcpy has the same issue.
So I don't see how to easily fix this, or rather I don't think we can fix it at
all apart from the case where we can see both the struct copy and previous
stores to the source (thus when you enable inlining).
