[Bug middle-end/53959] New: [4.8 Regression] 189.lucas in SPEC CPU 2000 miscompiled by LTO

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53959

             Bug #: 53959
           Summary: [4.8 Regression] 189.lucas in SPEC CPU 2000
                    miscompiled by LTO
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hjl.tools@gmail.com
                CC: rguenth@gcc.gnu.org


On Linux/x86-64, revision 189453:

http://gcc.gnu.org/ml/gcc-cvs/2012-07/msg00357.html

caused:

Compiling Binaries
  Building 189.lucas ref base lto default
Setting Up Run Directories
  Setting up 189.lucas ref base lto default: created
Running Benchmarks
  Running 189.lucas ref base lto default
*** Miscompare of lucas2.out, see
/export/gnu/import/git/gcc-regression/spec/200
0/spec/benchspec/CFP2000/189.lucas/run/00000002/lucas2.out.mis

with

-O2 -ffast-math -fwhole-program -flto=jobserver -fuse-linker-plugin
-DSPEC_CPU2000_LP64