[Bug rtl-optimization/68189] [4.9/5/6 Regression] wrong code at -Os and above on x86_64-linux-gnu by RTL if-conversion

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68189

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
          Component|tree-optimization           |rtl-optimization
           Assignee|rguenth at gcc dot gnu.org         |unassigned at gcc dot gnu.org
            Summary|[4.9/5/6 Regression] wrong  |[4.9/5/6 Regression] wrong
                   |code at -Os and above on    |code at -Os and above on
                   |x86_64-linux-gnu            |x86_64-linux-gnu by RTL
                   |                            |if-conversion

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fno-tree-pre hides the bug (what PRE does doesn't look invalid to me).
-fno-if-conversion fixes it as well (on the GCC 5 branch), disabling ce1 and
ce2
is required (ce1 does the bogus job).