[1/2,IRA,LRA] Fix PR86939, IRA incorrectly creates an interference between a pseudo register and a hard register

Index: gcc/ira-lives.c
===================================================================
--- gcc/ira-lives.c	(revision 263506)
+++ gcc/ira-lives.c	(working copy)
@@ -84,14 +84,19 @@  static int *allocno_saved_at_call;
    supplemental to recog_data.  */
 static alternative_mask preferred_alternatives;
 
-/* Record the birth of hard register REGNO, updating hard_regs_live and
-   hard reg conflict information for living allocnos.  */
+/* Record hard register REGNO as now being live.  */
 static void
-make_hard_regno_born (int regno)
+make_hard_regno_live (int regno)
 {
-  unsigned int i;
-
   SET_HARD_REG_BIT (hard_regs_live, regno);
+}
+
+/* Process the definition of hard register REGNO.  This updates
+   hard_regs_live and hard reg conflict information for living allocnos.  */
+static void
+make_hard_regno_dead (int regno)
+{
+  unsigned int i;
   EXECUTE_IF_SET_IN_SPARSESET (objects_live, i)
     {
       ira_object_t obj = ira_object_id_map[i];
@@ -99,28 +104,17 @@  make_hard_regno_born (int regno)
       SET_HARD_REG_BIT (OBJECT_CONFLICT_HARD_REGS (obj), regno);
       SET_HARD_REG_BIT (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), regno);
     }
-}
-
-/* Process the death of hard register REGNO.  This updates
-   hard_regs_live.  */
-static void
-make_hard_regno_dead (int regno)
-{
   CLEAR_HARD_REG_BIT (hard_regs_live, regno);
 }
 
-/* Record the birth of object OBJ.  Set a bit for it in objects_live,
-   start a new live range for it if necessary and update hard register
-   conflicts.  */
+/* Record object OBJ as now being live.  Set a bit for it in objects_live,
+   and start a new live range for it if necessary.  */
 static void
-make_object_born (ira_object_t obj)
+make_object_live (ira_object_t obj)
 {
-  live_range_t lr = OBJECT_LIVE_RANGES (obj);
-
   sparseset_set_bit (objects_live, OBJECT_CONFLICT_ID (obj));
-  IOR_HARD_REG_SET (OBJECT_CONFLICT_HARD_REGS (obj), hard_regs_live);
-  IOR_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), hard_regs_live);
 
+  live_range_t lr = OBJECT_LIVE_RANGES (obj);
   if (lr == NULL
       || (lr->finish != curr_point && lr->finish + 1 != curr_point))
     ira_add_live_range_to_object (obj, curr_point, -1);
@@ -154,14 +148,18 @@  update_allocno_pressure_excess_length (i
     }
 }
 
-/* Process the death of object OBJ, which is associated with allocno
-   A.  This finishes the current live range for it.  */
+/* Process the definition of object OBJ, which is associated with allocno A.
+   This finishes the current live range for it.  */
 static void
 make_object_dead (ira_object_t obj)
 {
   live_range_t lr;
 
   sparseset_clear_bit (objects_live, OBJECT_CONFLICT_ID (obj));
+
+  IOR_HARD_REG_SET (OBJECT_CONFLICT_HARD_REGS (obj), hard_regs_live);
+  IOR_HARD_REG_SET (OBJECT_TOTAL_CONFLICT_HARD_REGS (obj), hard_regs_live);
+
   lr = OBJECT_LIVE_RANGES (obj);
   ira_assert (lr != NULL);
   lr->finish = curr_point;
@@ -290,7 +288,7 @@  mark_pseudo_regno_live (int regno)
 	continue;
 
       inc_register_pressure (pclass, nregs);
-      make_object_born (obj);
+      make_object_live (obj);
     }
 }
 
@@ -327,7 +325,7 @@  mark_pseudo_regno_subword_live (int regn
     return;
 
   inc_register_pressure (pclass, 1);
-  make_object_born (obj);
+  make_object_live (obj);
 }
 
 /* Mark the register REG as live.  Store a 1 in hard_regs_live for
@@ -351,7 +349,7 @@  mark_hard_reg_live (rtx reg)
 	      aclass = ira_hard_regno_allocno_class[regno];
 	      pclass = ira_pressure_class_translate[aclass];
 	      inc_register_pressure (pclass, 1);
-	      make_hard_regno_born (regno);
+	      make_hard_regno_live (regno);
 	    }
 	  regno++;
 	}
@@ -457,8 +455,8 @@  mark_pseudo_regno_subword_dead (int regn
   make_object_dead (obj);
 }
 
-/* Mark the hard register REG as dead.  Store a 0 in hard_regs_live for the
-   register.  */
+/* Process the definition of hard register REG.  This updates hard_regs_live
+   and hard reg conflict information for living allocnos.  */
 static void
 mark_hard_reg_dead (rtx reg)
 {
@@ -1298,7 +1296,7 @@  process_bb_node_lives (ira_loop_tree_nod
 	    unsigned int regno = EH_RETURN_DATA_REGNO (j);
 	    if (regno == INVALID_REGNUM)
 	      break;
-	    make_hard_regno_born (regno);
+	    make_hard_regno_live (regno);
 	  }
 
       /* Allocnos can't go in stack regs at the start of a basic block
@@ -1317,7 +1315,7 @@  process_bb_node_lives (ira_loop_tree_nod
 	      ALLOCNO_TOTAL_NO_STACK_REG_P (a) = true;
 	    }
 	  for (px = FIRST_STACK_REG; px <= LAST_STACK_REG; px++)
-	    make_hard_regno_born (px);
+	    make_hard_regno_live (px);
 #endif
 	  /* No need to record conflicts for call clobbered regs if we
 	     have nonlocal labels around, as we don't ever try to
@@ -1340,7 +1338,7 @@  process_bb_node_lives (ira_loop_tree_nod
 		      && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER)
 #endif
 		  )
-		make_hard_regno_born (px);
+		make_hard_regno_live (px);
 	}
 
       EXECUTE_IF_SET_IN_SPARSESET (objects_live, i)
Index: gcc/lra-lives.c
===================================================================
--- gcc/lra-lives.c	(revision 263506)
+++ gcc/lra-lives.c	(working copy)
@@ -223,42 +223,41 @@  lra_intersected_live_ranges_p (lra_live_
 /* The corresponding bitmaps of BB currently being processed.  */
 static bitmap bb_killed_pseudos, bb_gen_pseudos;
 
-/* The function processing birth of hard register REGNO.  It updates
-   living hard regs, START_LIVING, and conflict hard regs for living
-   pseudos.  Conflict hard regs for the pic pseudo is not updated if
-   REGNO is REAL_PIC_OFFSET_TABLE_REGNUM and CHECK_PIC_PSEUDO_P is
-   true.  */
+/* Record hard register REGNO as now being live.  It updates
+   living hard regs and START_LIVING.  */
 static void
-make_hard_regno_born (int regno, bool check_pic_pseudo_p ATTRIBUTE_UNUSED)
+make_hard_regno_live (int regno)
 {
-  unsigned int i;
-
   lra_assert (regno < FIRST_PSEUDO_REGISTER);
   if (TEST_HARD_REG_BIT (hard_regs_live, regno))
     return;
   SET_HARD_REG_BIT (hard_regs_live, regno);
   sparseset_set_bit (start_living, regno);
-  EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
-#ifdef REAL_PIC_OFFSET_TABLE_REGNUM
-    if (! check_pic_pseudo_p
-	|| regno != REAL_PIC_OFFSET_TABLE_REGNUM
-	|| pic_offset_table_rtx == NULL
-	|| i != REGNO (pic_offset_table_rtx))
-#endif
-      SET_HARD_REG_BIT (lra_reg_info[i].conflict_hard_regs, regno);
   if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno))
     bitmap_set_bit (bb_gen_pseudos, regno);
 }
 
-/* Process the death of hard register REGNO.  This updates
-   hard_regs_live and START_DYING.  */
+/* Process the definition of hard register REGNO.  This updates
+   hard_regs_live, START_DYING and conflict hard regs for living
+   pseudos.  Conflict hard regs for the pic pseudo is not updated if
+   REGNO is REAL_PIC_OFFSET_TABLE_REGNUM and CHECK_PIC_PSEUDO_P is
+   true.  */
 static void
-make_hard_regno_dead (int regno)
+make_hard_regno_dead (int regno, bool check_pic_pseudo_p ATTRIBUTE_UNUSED)
 {
   lra_assert (regno < FIRST_PSEUDO_REGISTER);
   if (! TEST_HARD_REG_BIT (hard_regs_live, regno))
     return;
   sparseset_set_bit (start_dying, regno);
+  unsigned int i;
+  EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, i)
+#ifdef REAL_PIC_OFFSET_TABLE_REGNUM
+    if (! check_pic_pseudo_p
+	|| regno != REAL_PIC_OFFSET_TABLE_REGNUM
+	|| pic_offset_table_rtx == NULL
+	|| i != REGNO (pic_offset_table_rtx))
+#endif
+      SET_HARD_REG_BIT (lra_reg_info[i].conflict_hard_regs, regno);
   CLEAR_HARD_REG_BIT (hard_regs_live, regno);
   if (fixed_regs[regno] || TEST_HARD_REG_BIT (hard_regs_spilled_into, regno))
     {
@@ -267,9 +266,9 @@  make_hard_regno_dead (int regno)
     }
 }
 
-/* Mark pseudo REGNO as living at program point POINT, update conflicting
-   hard registers of the pseudo and START_LIVING, and start a new live
-   range for the pseudo corresponding to REGNO if it is necessary.  */
+/* Mark pseudo REGNO as living at program point POINT, update START_LIVING
+   and start a new live range for the pseudo corresponding to REGNO if it
+   is necessary.  */
 static void
 mark_pseudo_live (int regno, int point)
 {
@@ -278,7 +277,6 @@  mark_pseudo_live (int regno, int point)
   lra_assert (regno >= FIRST_PSEUDO_REGISTER);
   lra_assert (! sparseset_bit_p (pseudos_live, regno));
   sparseset_set_bit (pseudos_live, regno);
-  IOR_HARD_REG_SET (lra_reg_info[regno].conflict_hard_regs, hard_regs_live);
 
   if ((complete_info_p || lra_get_regno_hard_regno (regno) < 0)
       && ((p = lra_reg_info[regno].live_ranges) == NULL
@@ -301,6 +299,9 @@  mark_pseudo_dead (int regno, int point)
   lra_assert (sparseset_bit_p (pseudos_live, regno));
   sparseset_clear_bit (pseudos_live, regno);
   sparseset_set_bit (start_dying, regno);
+
+  IOR_HARD_REG_SET (lra_reg_info[regno].conflict_hard_regs, hard_regs_live);
+
   if (complete_info_p || lra_get_regno_hard_regno (regno) < 0)
     {
       p = lra_reg_info[regno].live_ranges;
@@ -322,7 +323,7 @@  mark_regno_live (int regno, machine_mode
   if (regno < FIRST_PSEUDO_REGISTER)
     {
       for (last = end_hard_regno (mode, regno); regno < last; regno++)
-	make_hard_regno_born (regno, false);
+	make_hard_regno_live (regno);
     }
   else
     {
@@ -349,7 +350,7 @@  mark_regno_dead (int regno, machine_mode
   if (regno < FIRST_PSEUDO_REGISTER)
     {
       for (last = end_hard_regno (mode, regno); regno < last; regno++)
-	make_hard_regno_dead (regno);
+	make_hard_regno_dead (regno, false);
     }
   else
     {
@@ -834,13 +835,13 @@  process_bb_lives (basic_block bb, int &c
 
       for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
 	if (reg->type != OP_IN)
-	  make_hard_regno_born (reg->regno, false);
+	  make_hard_regno_live (reg->regno);
 
       if (curr_id->arg_hard_regs != NULL)
 	for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
 	  if (regno >= FIRST_PSEUDO_REGISTER)
 	    /* It is a clobber.  */
-	    make_hard_regno_born (regno - FIRST_PSEUDO_REGISTER, false);
+	    make_hard_regno_live (regno - FIRST_PSEUDO_REGISTER);
 
       sparseset_copy (unused_set, start_living);
 
@@ -857,13 +858,14 @@  process_bb_lives (basic_block bb, int &c
       for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
 	if (reg->type == OP_OUT
 	    && ! reg_early_clobber_p (reg, n_alt) && ! reg->subreg_p)
-	  make_hard_regno_dead (reg->regno);
+	  make_hard_regno_dead (reg->regno, false);
 
       if (curr_id->arg_hard_regs != NULL)
 	for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
 	  if (regno >= FIRST_PSEUDO_REGISTER)
-	    /* It is a clobber.  */
-	    make_hard_regno_dead (regno - FIRST_PSEUDO_REGISTER);
+	    /* It is a clobber.  Don't create conflict of used
+	       REAL_PIC_OFFSET_TABLE_REGNUM and the pic pseudo.  */
+	    make_hard_regno_dead (regno - FIRST_PSEUDO_REGISTER, true);
 
       if (call_p)
 	{
@@ -920,14 +922,14 @@  process_bb_lives (basic_block bb, int &c
 
       for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
 	if (reg->type == OP_IN)
-	  make_hard_regno_born (reg->regno, false);
+	  make_hard_regno_live (reg->regno);
 
       if (curr_id->arg_hard_regs != NULL)
 	/* Make argument hard registers live.  Don't create conflict
 	   of used REAL_PIC_OFFSET_TABLE_REGNUM and the pic pseudo.  */
 	for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
 	  if (regno < FIRST_PSEUDO_REGISTER)
-	    make_hard_regno_born (regno, true);
+	    make_hard_regno_live (regno);
 
       sparseset_and_compl (dead_set, start_living, start_dying);
 
@@ -952,7 +954,7 @@  process_bb_lives (basic_block bb, int &c
 	      if (reg2->type != OP_OUT && reg2->regno == reg->regno)
 		break;
 	    if (reg2 == NULL)
-	      make_hard_regno_dead (reg->regno);
+	      make_hard_regno_dead (reg->regno, false);
 	  }
 
       if (need_curr_point_incr)
@@ -995,7 +997,7 @@  process_bb_lives (basic_block bb, int &c
 
 	if (regno == INVALID_REGNUM)
 	  break;
-	make_hard_regno_born (regno, false);
+	make_hard_regno_live (regno);
       }
 
   /* Pseudos can't go in stack regs at the start of a basic block that
@@ -1009,7 +1011,7 @@  process_bb_lives (basic_block bb, int &c
       EXECUTE_IF_SET_IN_SPARSESET (pseudos_live, px)
 	lra_reg_info[px].no_stack_p = true;
       for (px = FIRST_STACK_REG; px <= LAST_STACK_REG; px++)
-	make_hard_regno_born (px, false);
+	make_hard_regno_live (px);
 #endif
       /* No need to record conflicts for call clobbered regs if we
 	 have nonlocal labels around, as we don't ever try to
@@ -1029,7 +1031,7 @@  process_bb_lives (basic_block bb, int &c
 		  && REGNO (pic_offset_table_rtx) >= FIRST_PSEUDO_REGISTER)
 #endif
 	      )
-	    make_hard_regno_born (px, false);
+	    make_hard_regno_live (px);
     }
 
   bool live_change_p = false;