[Bug rtl-optimization/49390] New: [4.6/4.7 Regression] GCSE miscompilation

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49390

           Summary: [4.6/4.7 Regression] GCSE miscompilation
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: ja...@gcc.gnu.org
            Target: x86_64-linux


Created attachment 24507
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24507
rh712480.c

The attached testcase is miscompiled, starting with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=161534
at -O2, -O2 -fno-gcse fixes it.