[Bug target/17962] New: small fp vector uses sse/mmx vectors and is not aligned

["janis187 at us dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The following test case is compiled to use hardware vector support
for -msse, -msse2, or -mmmx even though the vector type is smaller
than what the hardware supports for float elements.  The vector
variables are given an alignment of 4 bytes, causing a seg fault at
runtime.
                                                                                
  __attribute__ ((vector_size (8))) float v1, v2, v3;
                                                                                
  int
  main ()
  {
    v1 = v2 + v3;
    return 0;
  }
                                                                                
Last tested with a native i686-pc-linux-gnu compiler with today's
mainline.

-- 
           Summary: small fp vector uses sse/mmx vectors and is not aligned
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis187 at us dot ibm dot com
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17962