[Bug rtl-optimization/57344] [4.7/4.8/4.9 Regression] wrong code with pragma pack(1) and -O1 on x86

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57344

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|middle-end                  |rtl-optimization
      Known to work|                            |4.7.0
   Target Milestone|4.8.1                       |4.7.4
            Summary|[4.8/4.9 Regression] wrong  |[4.7/4.8/4.9 Regression]
                   |code with pragma pack(1)    |wrong code with pragma
                   |and -O1 on x86              |pack(1) and -O1 on x86
      Known to fail|                            |4.7.1, 4.7.3, 4.8.0, 4.9.0

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Bi-secting on the 4.7 branch should reveal the offending patch.  Tree
optimizers
look good, so the issue is on the RTL or target side.