[Bug optimization/12198] New: Miscompilation of case ranges

[pbrook at gcc dot gnu dot org]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12198

           Summary: Miscompilation of case ranges
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: critical
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pbrook at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org

Switch statements containing the "Case Ranges" extension are miscompiled. The 
following test fails when i != 1.  
 
int main() 
{ 
   int i; 
   i = 2; 
   switch (i) 
      { 
      case 1 ... 5: 
         goto L1; 
      default: 
         abort (); 
         goto L1; 
      } 
   L1: 
   exit(0); 
}