re PR rtl-optimization/86939 (IRA incorrectly creates an interference between a pseudo register and a hard register)

gcc/
	PR rtl-optimization/86939
	* ira-lives.c (make_hard_regno_born): Rename from this...
	(make_hard_regno_live): ... to this.  Remove update to conflict
	information.  Update function comment.
	(make_hard_regno_dead): Add conflict information update.  Update
	function comment.
	(make_object_born): Rename from this...
	(make_object_live): ... to this.  Remove update to conflict information.
	Update function comment.
	(make_object_dead):  Add conflict information update.  Update function
	comment.
	(mark_pseudo_regno_live): Call make_object_live.
	(mark_pseudo_regno_subword_live): Likewise.
	(mark_hard_reg_dead): Update function comment.
	(mark_hard_reg_live): Call make_hard_regno_live.
	(process_bb_node_lives): Likewise.
	* lra-lives.c (make_hard_regno_born): Rename from this...
	(make_hard_regno_live): ... to this.  Remove update to conflict
	information.  Remove now uneeded check_pic_pseudo_p argument.
	Update function comment.
	(make_hard_regno_dead): Add check_pic_pseudo_p argument and add update
	to conflict information.  Update function comment.
	(mark_pseudo_live): Remove update to conflict information.  Update
	function comment.
	(mark_pseudo_dead): Add conflict information update.
	(mark_regno_live): Call make_hard_regno_live.
	(mark_regno_dead): Call make_hard_regno_dead with new arguement.
	(process_bb_lives): Call make_hard_regno_live and make_hard_regno_dead.

From-SVN: r264726

1 files changed, 38 insertions, 36 deletions

diff --git a/gcc/lra-lives.c b/gcc/lra-lives.c
index 565c68b..b41df60 100644
--- a/gcc/lra-lives.c
+++ b/gcc/lra-lives.c
@@ -223,42 +223,41 @@ lra_intersected_live_ranges_p (lra_live_range_t r1, lra_live_range_t r2)
 /* 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 mode, int point)
   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 mode, int point)
   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 &curr_point, bool dead_insn_p)
 
       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 &curr_point, bool dead_insn_p)
       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 &curr_point, bool dead_insn_p)
 
       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 &curr_point, bool dead_insn_p)
 	      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 &curr_point, bool dead_insn_p)
 
 	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 &curr_point, bool dead_insn_p)
       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 &curr_point, bool dead_insn_p)
 		  && 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;