re PR middle-end/37243 (IRA causes wrong code generation)

gcc/
	PR middle-end/37243
	* ira-build.c (form_loop_tree): Reverse BB walk.
	(create_bb_allocnos): Likewise.
	* ira-lives.c (make_regno_born_and_dead, regs_set): Delete.
	(mark_reg_store): Rename to...
	(mark_ref_live): ...this and take a df_ref argument instead of
	note_stores arguments.  Assert that we have a register.
	(mark_reg_clobber): Delete.
	(def_conflicts_with_inputs_p): New function.
	(mark_reg_conflicts): Delete.
	(mark_reg_death): Rename to...
	(mark_ref_dead): ...this and take a df_ref argument instead of
	a register.  Assert that we have a register.
	(process_bb_node_lives): Hoist frequency calculation out of
	instruction walk.  Convert from a forwards scan to a backwards scan.
	Use DF_REF_USES and DF_REF_DEFS instead of register notes and
	note_stores.  Remove EH_RETURN_DATA_REGNO and regs_set handling.
	(create_allocno_live_ranges): Don't create regs_set.

From-SVN: r139993

gcc/ChangeLog

+2008-09-04  Richard Sandiford  <rdsandiford@googlemail.com>
+
+	PR middle-end/37243
+	* ira-build.c (form_loop_tree): Reverse BB walk.
+	(create_bb_allocnos): Likewise.
+	* ira-lives.c (make_regno_born_and_dead, regs_set): Delete.
+	(mark_reg_store): Rename to...
+	(mark_ref_live): ...this and take a df_ref argument instead of
+	note_stores arguments.  Assert that we have a register.
+	(mark_reg_clobber): Delete.
+	(def_conflicts_with_inputs_p): New function.
+	(mark_reg_conflicts): Delete.
+	(mark_reg_death): Rename to...
+	(mark_ref_dead): ...this and take a df_ref argument instead of
+	a register.  Assert that we have a register.
+	(process_bb_node_lives): Hoist frequency calculation out of
+	instruction walk.  Convert from a forwards scan to a backwards scan.
+	Use DF_REF_USES and DF_REF_DEFS instead of register notes and
+	note_stores.  Remove EH_RETURN_DATA_REGNO and regs_set handling.
+	(create_allocno_live_ranges): Don't create regs_set.
+
 2008-09-04  Ian Lance Taylor  <iant@google.com>
 
 	* rtl.h (LABEL_REF_NONLOCAL_P): Don't check for REG_LABEL_OPERAND

gcc/ira-build.c

@@ -310,7 +310,7 @@ form_loop_tree (void)
 	 ira_loop_nodes[i].children = NULL;
 	 ira_loop_nodes[i].subloops = NULL;
        }
-  FOR_EACH_BB_REVERSE (bb)
+  FOR_EACH_BB (bb)
     {
       bb_node = &ira_bb_nodes[bb->index];
       bb_node->bb = bb;
@@ -1343,7 +1343,7 @@ create_bb_allocnos (ira_loop_tree_node_t bb_node)
 
   curr_bb = bb = bb_node->bb;
   ira_assert (bb != NULL);
-  FOR_BB_INSNS (bb, insn)
+  FOR_BB_INSNS_REVERSE (bb, insn)
     if (INSN_P (insn))
       create_insn_allocnos (PATTERN (insn), false);
   /* It might be a allocno living through from one subloop to