[Bug middle-end/36194] New: [4.1/4.2/4.3/4.4 Regression] Truncation optimization in combine can remove necessary truncations

[nemet at gcc dot gnu dot org]

On mips64-linux-gnu the following testcase aborts:

  void abort (void);

  __attribute__ ((noinline)) void
  f (int i)
  {
    if (i != 0x87654321)
      abort ();
    asm ("");
  }

  __attribute__ ((noinline)) void
  g (long long a)
  {
    f (a);
    asm ("");
  }

  main ()
  {
    g (0x1234567887654321ll);
    return 0;
  }


-- 
           Summary: [4.1/4.2/4.3/4.4 Regression] Truncation optimization in
                    combine can remove necessary truncations
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: nemet at gcc dot gnu dot org
        ReportedBy: nemet at gcc dot gnu dot org
GCC target triplet: mips64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36194