expr.c (expand_assignment): Add assertion to prevent emitting null rtx for movmisalig...

expr.c (expand_assignment): Add assertion to prevent emitting null rtx for movmisalign pattern.

	gcc/
	* expr.c (expand_assignment): Add assertion to prevent emitting
	null rtx for movmisalign pattern.
	(expand_expr_real_1): Likewise.
	* config/arm/arm.c (arm_builtin_support_vector_misalignment): New.
	(TARGET_VECTORIZE_SUPPORT_VECTOR_MISALIGNMENT): New. Use above.
	(arm_vector_alignment_reachable): New.
	(TARGET_VECTORIZE_VECTOR_ALIGNMENT_REACHABLE): New. Use above.
	(neon_vector_mem_operand): Disallow PRE_DEC for misaligned loads.
	(arm_print_operand): Include alignment qualifier in %A.
	* config/arm/neon.md (UNSPEC_MISALIGNED_ACCESS): New constant.
	(movmisalign<mode>): New expander.
	(movmisalign<mode>_neon_store, movmisalign<mode>_neon_load): New
	insn patterns.

	gcc/testsuite/
	* gcc.dg/vect/vect-42.c: Use vect_element_align instead of
	vect_hw_misalign.
	* gcc.dg/vect/vect-60.c: Likewise.
	* gcc.dg/vect/vect-56.c: Likewise.
	* gcc.dg/vect/vect-93.c: Likewise.
	* gcc.dg/vect/no-scevccp-outer-8.c: Likewise.
	* gcc.dg/vect/vect-95.c: Likewise.
	* gcc.dg/vect/vect-96.c: Likewise.
	* gcc.dg/vect/vect-outer-5.c: Use quad-word vectors when available.
	* gcc.dg/vect/slp-25.c: Likewise.
	* gcc.dg/vect/slp-3.c: Likewise.
	* gcc.dg/vect/vect-multitypes-1.c: Likewise.
	* gcc.dg/vect/no-vfa-pr29145.c: Likewise.
	* gcc.dg/vect/vect-multitypes-4.c: Likewise. Use vect_element_align.
	* gcc.dg/vect/vect-109.c: Likewise.
	* gcc.dg/vect/vect-peel-1.c: Likewise.
	* gcc.dg/vect/vect-peel-2.c: Likewise.
	* lib/target-supports.exp
	(check_effective_target_arm_vect_no_misalign): New.
	(check_effective_target_vect_no_align): Use above.
	(check_effective_target_vect_element_align): New.
	(add_options_for_quad_vectors): New.

From-SVN: r164941