gcc/

	PR target/65105
	* config/i386/i386.c: Include dbgcnt.h.
	(has_non_address_hard_reg): New.
	(convertible_comparison_p): New.
	(scalar_to_vector_candidate_p): New.
	(remove_non_convertible_regs): New.
	(scalar_chain): New.
	(scalar_chain::scalar_chain): New.
	(scalar_chain::~scalar_chain): New.
	(scalar_chain::add_to_queue): New.
	(scalar_chain::mark_dual_mode_def): New.
	(scalar_chain::analyze_register_chain): New.
	(scalar_chain::add_insn): New.
	(scalar_chain::build): New.
	(scalar_chain::compute_convert_gain): New.
	(scalar_chain::replace_with_subreg): New.
	(scalar_chain::replace_with_subreg_in_insn): New.
	(scalar_chain::emit_conversion_insns): New.
	(scalar_chain::make_vector_copies): New.
	(scalar_chain::convert_reg): New.
	(scalar_chain::convert_op): New.
	(scalar_chain::convert_insn): New.
	(scalar_chain::convert): New.
	(convert_scalars_to_vector): New.
	(pass_data_stv): New.
	(pass_stv): New.
	(make_pass_stv): New.
	(ix86_option_override): Created and register stv pass.
	(flag_opts): Add -mstv.
	(ix86_option_override_internal): Likewise.
	* config/i386/i386.md (SWIM1248x): New.
	(*movdi_internal): Add xmm to mem alternative for TARGET_STV.
	(and<mode>3): Use SWIM1248x iterator instead of SWIM.
	(*anddi3_doubleword): New.
	(*zext<mode>_doubleword): New.
	(*zextsi_doubleword): New.
	(<code><mode>3): Use SWIM1248x iterator instead of SWIM.
	(*<code>di3_doubleword): New.
	* config/i386/i386.opt (mstv): New.
	* dbgcnt.def (stv_conversion): New.

gcc/testsuite/

	PR target/65105
	* gcc.target/i386/pr65105-1.c: New.
	* gcc.target/i386/pr65105-2.c: New.
	* gcc.target/i386/pr65105-3.c: New.
	* gcc.target/i386/pr65105-4.C: New.
	* gcc.dg/lower-subreg-1.c: Add -mno-stv options for ia32.

From-SVN: r228231