Merged latest trunk changes to ira-select.

From-SVN: r279316

gcc/ChangeLog

@@ -1,3 +1,21 @@
+2018-07-18  Vladimir Makarov  <vmakarov@redhat.com>
+
+	Merge with trunk.
+	* common.opt (fira-select): New.  Choose the selection algorithm
+	by default.
+	* ira-costs.c (struct op_info, op_infos, insn_selection): New.
+	(insn_selections): New.
+	(CONST_POOL_OK_P, SMALL_REGISTER_CLASS_P, general_constant_p):
+	New.
+	(insn_constraints, setup_insn_alt): New.
+	(record_address_regs): Forward declaration.
+	(define_op_cost_from_alt): New.
+	(scan_one_insn): Call setup_insn_alt and define_op_cost_from_alt
+	for the selection algorithm.
+	(find_costs_and_classes): Release insn_constraints and
+	insn_selections.  Don't reuse already calculated pseudo classes
+	for the selection algorithm.
+
 2019-11-22  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/92458

gcc/common.opt

@@ -1836,6 +1836,10 @@ Common Report Var(flag_ira_loop_pressure) Optimization
 Use IRA based register pressure calculation
 in RTL loop optimizations.
 
+fira-select
+Common Report Var(flag_ira_select) Init(1)
+Pseudo-register class calculations based on insn alternative selection.
+
 fira-share-save-slots
 Common Report Var(flag_ira_share_save_slots) Init(1) Optimization
 Share slots for saving different hard registers.