re PR rtl-optimization/69896 (wrong code with -frename-registers @ x64_64)

	PR rtl-optimization/69896
	* tree-vect-generic.c (get_compute_type): Avoid single element
	vector types.

From-SVN: r233777

gcc/ChangeLog

+2016-02-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/69896
+	* tree-vect-generic.c (get_compute_type): Avoid single element
+	vector types.
+
 2016-02-26  Evandro Menezes  <e.menezes@samsung.com>
 
 	Rename the AArch64 tuning option and related functions to enable the
 	Newton series for the reciprocal square root to reflect its
 	approximative characteristic.
 
-	gcc/
 	* config/aarch64/aarch64-protos.h (aarch64_emit_swrsqrt): Rename
 	function to "aarch64_emit_approx_rsqrt".
 	* config/aarch64/aarch64-tuning-flags.def: Rename tuning flag to

gcc/tree-vect-generic.c

@@ -1405,6 +1405,7 @@ get_compute_type (enum tree_code code, optab op, tree type)
       if (vector_compute_type != NULL_TREE
 	  && (TYPE_VECTOR_SUBPARTS (vector_compute_type)
 	      < TYPE_VECTOR_SUBPARTS (compute_type))
+	  && TYPE_VECTOR_SUBPARTS (vector_compute_type) > 1
 	  && (optab_handler (op, TYPE_MODE (vector_compute_type))
 	      != CODE_FOR_nothing))
 	compute_type = vector_compute_type;