2012-10-29  Marc Glisse  <marc.glisse@inria.fr>

	PR middle-end/55027

gcc/
	* tree.c (real_zerop, real_onep, real_twop, real_minus_onep):
	Handle VECTOR_CST.

testsuite/
	* gcc.dg/pr55027.c: New testcase.

From-SVN: r192954