[Bug middle-end/63311] [4.9/5 Regression] -O1 optimization introduces valgrind warning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63311

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
      Known to work|                            |4.8.3
      Known to fail|                            |4.9.2

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed that it is ifcombine.  Not sure if I'd call it wrong-code though.

Note that there are no default-defs involved thus ifcombine doesn't see
must-uninits and disabling its transform when maybe-uninits are seen
is IMHO bogus.

Not sure what to do about this one.  There is no way to preserve evaluation
order (no andif / orif on gimple).