re PR rtl-optimization/57193 (suboptimal register allocation for SSE registers)

re PR rtl-optimization/57193 (suboptimal register allocation for SSE registers)

2018-02-09  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/57193
	* ira-color.c (struct allocno_color_data): Add member
	conflict_allocno_hard_prefs.
	(update_conflict_allocno_hard_prefs): New.
	(bucket_allocno_compare_func): Add a preference based on
	conflict_allocno_hard_prefs.
	(push_allocno_to_stack): Update conflict_allocno_hard_prefs.
	(color_allocnos): Remove a dead code.  Initiate
	conflict_allocno_hard_prefs.  Call update_costs_from_prefs.

2018-02-09  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/57193
	* gcc.target/i386/57193.c: New.

From-SVN: r257537