[Bug rtl-optimization/16354] New: va-arg-25.c -Os regression fails on i686

["jbuck at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

This test has failed for a while, but I can't find a bug report on it, so I'm
adding one here.

The test execute/va-arg-25.c with the -Os option compiles, but fails with a 
runtime abort with gcc 3.4.0, gcc 3.4.1, and the trunk.

With gcc 3.3.4, the test causes an ICE, with the message

internal compiler error: in ix86_function_arg_boundary, at config/i386/i386.c:2444

gcc 3.2.3 fails to compile the test because the vector support
needed is not present.

To repeat:

gcc -Os <dir>/gcc/testsuite/gcc.c-torture/execute/va-arg-25.c
a.out

I guess this isn't a regression, as I can't find a version that works.

I'm guessing "rtl-optimization" because only -Os fails; don't trust that guess.

-- 
           Summary: va-arg-25.c -Os regression fails on i686
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jbuck at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16354