* c-common.h (same_scalar_type_ignoring_signedness): Protoize.

	* c-common.c (same_scalar_type_ignoring_signedness): New.

	* c-typeck.c (build_binary_op): Check compatability of vector
	types.  Move error report after switch.
	Do not clobber code[01] on *_DIV_EXPR case.

	* testsuite/gcc.dg/simd-1.c: Update error messages.
	* testsuite/gcc.dg/simd-1b.c: Re-enable tests.  Update error
	messages.
	* testsuite/gcc.dg/simd-2.c: Update error messages.
	* testsuite/gcc.dg/simd-4.c: New.

From-SVN: r100976