[Bug rtl-optimization/49807] Missed byte (subreg) extraction when storing to volatile mem

[gjl at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49807

--- Comment #5 from Georg-Johann Lay <gjl at gcc dot gnu.org> 2011-07-21 20:46:05 UTC ---
In this case it would not reduce the size of the store, but how can this be
seen?
It cannot be seen from the insn/pattern alone.

Do you have an idea how to attack this optimization flaw?