GCC trunk gets a ICE when building SPEC CPU2000 test 173.applu and several others with "-O2 -mvsx -mno-altivec -ftree-vectorize", as demonstrated by this minimized testcase:

      subroutine ssor
      implicit real*8 (a-h,o-z)
      parameter (iar = 60)
      common/cgcon/ nx, ny, nz
      common/cvar/ u(5,iar,iar,iar), rsd(5,iar,iar,iar)
      common/ctscon/ itmax
      do istep = 1, itmax
         call jacld
         do k = 2, nz-1
            do j = 2, ny-1
               do i = 2, nx-1
                  do m = 1, 5
                     u( m, i, j, k ) = u( m, i, j, k )
     $                    + tmp * rsd( m, i, j, k )
                  end do
               end do
            end do
         end do
      end do
      return
      end

elm3b149% /home/janis/tools/gcc-trunk-anonsvn/bin/gfortran -O2 -mvsx -mno-altivec -ftree-vectorize -c bug.f
bug.f: In function ‘ssor’:
bug.f:21:0: internal compiler error: in change_address_1, at emit-rtl.c:1912
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

VSX support is new in GCC 4.5 so this is not a regression from earlier releases.