re PR target/66697 (Feature request: -mstackrealign and force_align_arg_pointer for...

re PR target/66697 (Feature request: -mstackrealign and force_align_arg_pointer for x86_64)

	PR target/66697
	* config/i386/i386.c (ix86_option_override_internal): Always use
	8-byte minimum stack boundary in 64-bit mode.
	(ix86_compute_frame_layout): Remove assert on INCOMING_STACK_BOUNDARY.
	(ix86_emit_save_reg_using_mov): Support unaligned SSE store.
	Add a REG_CFA_EXPRESSION note if needed.
	(ix86_emit_restore_sse_regs_using_mov): Support unaligned SSE load.
	(ix86_handle_force_align_arg_pointer_attribute): New.
	(ix86_minimum_incoming_stack_boundary): Remove TARGET_64BIT check.
	(ix86_attribute_table): Set ix86_force_align_arg_pointer_string
	with ix86_handle_force_align_arg_pointer_attribute.
	* config/i386/i386.h (MIN_STACK_BOUNDARY): Set to BITS_PER_WORD.

testsuite/ChangeLog:

	PR target/66697
	* gcc.target/i386/20060512-1.c: Remove ia32 requirement.
	(PUSH, POP): New defines.
	(sse2_test): Use PUSH and POP to misalign runtime stack.
	* gcc.target/i386/20060512-2.c: Remove ia32 requirement.

From-SVN: r228577