[Bug rtl-optimization/34902] New: Wrong code on -O3

["dominik dot strasser at onespin-solutions dot com" <gcc-bugzilla at gcc dot gnu dot org>]

For the attached C/C++ source, illegal code is produced when -O3 is used.
One source statement is omitted. This statement is marked by
/** ERROR: no code will be generated for the following statement **/
in the source code.

The issue can be seen on different platforms, so it seems to be in the RTL
optimization part and independent of the backend. I tried on x86 x86_64 and
SPARC.

Call "make ok" to get the OK version, "make bug" to get the buggy one. The
driver built around the source prints "ok" or "error" respectively.

As this is a genereted bison source, it is rather huge, any attempts to make it
smaller failed.


-- 
           Summary: Wrong code on -O3
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dominik dot strasser at onespin-solutions dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34902