gcc/ChangeLog

	* common.opt (flag_ira_hoist_pressure): New.
	* doc/invoke.texi (-fira-hoist-pressure): Describe.
	* ira-costs.c (ira_set_pseudo_classes): New parameter.
	* ira.h: Update copyright dates.
	(ira_set_pseudo_classes): Update prototype.
	* haifa-sched.c (sched_init): Update call.
	* ira.c (ira): Update call.
	* regmove.c: Update copyright dates.
	(regmove_optimize): Update call.
	* loop-invariant.c: Update copyright dates.
	(move_loop_invariants): Update call.
	* gcse.c: (struct bb_data): New structure.
	(BB_DATA): New macro.
	(curr_bb, curr_reg_pressure): New static variables.
	(should_hoist_expr_to_dom): Rename from hoist_expr_reaches_here_p.
	Change parameter expr_index to expr.
	New parameters pressure_class, nregs and hoisted_bbs.
	Use reg pressure to determine the distance expr can be hoisted.
	(hoist_code): Use reg pressure to direct the hoist process.
	(get_regno_pressure_class, get_pressure_class_and_nregs)
	(change_pressure, calculate_bb_reg_pressure): New.
	(one_code_hoisting_pass): Calculate register pressure. Allocate
	and free data.

	gcc/testsuite/ChangeLog
	* testsuite/gcc.dg/hoist-register-pressure.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192604 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 6 insertions, 3 deletions

diff --git a/gcc/ira-costs.c b/gcc/ira-costs.c
index 0c59b03ded2..034eff831ed 100644
--- a/gcc/ira-costs.c
+++ b/gcc/ira-costs.c
@@ -2048,9 +2048,10 @@ ira_costs (void)
   ira_free (total_allocno_costs);
 }
 
-/* Entry function which defines classes for pseudos.  */
+/* Entry function which defines classes for pseudos.
+   Set pseudo_classes_defined_p only if DEFINE_PSEUDO_CLASSES is true.  */
 void
-ira_set_pseudo_classes (FILE *dump_file)
+ira_set_pseudo_classes (bool define_pseudo_classes, FILE *dump_file)
 {
   allocno_p = false;
   internal_flag_ira_verbose = flag_ira_verbose;
@@ -2059,7 +2060,9 @@ ira_set_pseudo_classes (FILE *dump_file)
   initiate_regno_cost_classes ();
   find_costs_and_classes (dump_file);
   finish_regno_cost_classes ();
-  pseudo_classes_defined_p = true;
+  if (define_pseudo_classes)
+    pseudo_classes_defined_p = true;
+
   finish_costs ();
 }