lcm.c (optimize_mode_switching): Do not rebuild liveness information when no changes has been made.

	* lcm.c (optimize_mode_switching):  Do not rebuild liveness information
	when no changes has been made.

	* gcse.c (reg_set_bitmap): Turn into reg_set.
	(modify_mem_list_set, canon_modify_mem_list_set)
	(clear_modify_mem_tables, free_modify_mem_tables): New.
	(gcse_main); Use free_modify_mem_tables.
	(free_gcse_mem): Likewise; free the bitmaps.
	(alloc_gcse_main): Initialize the bitmaps.
	(canon_list_insert): Set canon_modify_mem_list_set.
	(record_last_mem_set_info): Likewise; set modify_mem_list_set.
	(compute_hash_table): Use clear_modify_mem_tables.
	(reset_opr_set_tables): Likewise.
	(oprs_not_set_p): reg_set_bitmap is regset.
	(mark_set, mark_clobber): Likewise.

	* df.h (DF_EQUIV_NOTES): New constant.
	(df_insn_refs_record): Record uses inside or REG_EQUIV/EQUAL notes
	when asked for.

	* sched-rgn.c (CHECK_DEAD_NOTES): New constant.
	(init_regions, schedule_insns): Conditionalize the checking
	code by CHECK_DEAD_NOTES; avoid multiple calls to update_life_info.

From-SVN: r46634

1 files changed, 17 insertions, 0 deletions

diff --git a/gcc/df.c b/gcc/df.c
index 75148733e59..3318d456a55 100644
--- a/gcc/df.c
+++ b/gcc/df.c
@@ -1224,8 +1224,25 @@ df_insn_refs_record (df, bb, insn)
 
   if (INSN_P (insn))
     {
+      rtx note;
+
       /* Record register defs */
       df_defs_record (df, PATTERN (insn), bb, insn);
+
+      if (df->flags & DF_EQUIV_NOTES)
+	for (note = REG_NOTES (insn); note;
+	     note = XEXP (note, 1))
+	  {
+	    switch (REG_NOTE_KIND (note))
+	      {
+		case REG_EQUIV:
+		case REG_EQUAL:
+		  df_uses_record (df, &XEXP (note, 0), DF_REF_REG_USE,
+				  bb, insn);
+		default:
+		  break;
+	      }
+	  }
       
       if (GET_CODE (insn) == CALL_INSN)
 	{