That one is weird, because it's only triggered with -std=c99 (or -std=gnu99):

$ cat foo.c                 
void foo ()
{
  typedef _Complex float __attribute__((mode(TC))) c128;
  c128 x, y;
  x *= y;
}
$ gcc -c foo.c      
$ gcc -c -std=c99 foo.c
foo.c: In function ‘foo’:
foo.c:6: internal compiler error: Segmentation fault


-- 
           Summary: ICE with complex __float128
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: fxcoudert at gcc dot gnu dot org
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32191

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