bb-reorder.c (make_reorder_chain_1): Search harder for the vax casesi fallthru edge.

2002-06-21  Richard Henderson  <rth@redhat.com>

* bb-reorder.c (make_reorder_chain_1): Search harder for the
vax casesi fallthru edge.
* cfglayout.c (cleanup_unconditional_jumps): Use
redirect_edge_succ_nodup.  Do not delete ADDR_VEC insns as dead.
* cfgrtl.c (force_nonfallthru_and_redirect): Place redirection
block after ADDR_VEC.

From-SVN: r54885

gcc/ChangeLog

+2002-06-21  Richard Henderson  <rth@redhat.com>
+
+	* bb-reorder.c (make_reorder_chain_1): Search harder for the
+	vax casesi fallthru edge. 
+	* cfglayout.c (cleanup_unconditional_jumps): Use 
+	redirect_edge_succ_nodup.  Do not delete ADDR_VEC insns as dead.
+	* cfgrtl.c (force_nonfallthru_and_redirect): Place redirection
+	block after ADDR_VEC.
+
 2002-06-21  Rainer Orth  <ro@TechFak.Uni-Bielefeld.DE>
 
 	* config/sparc/t-linux64 (EXTRA_MULTILIB_PARTS): Add crtfastmath.o.

gcc/bb-reorder.c

@@ -209,17 +209,21 @@ make_reorder_chain_1 (bb, prev)
   /* In the absence of a prediction, disturb things as little as possible
      by selecting the old "next" block from the list of successors.  If
      there had been a fallthru edge, that will be the one.  */
+  /* Note that the fallthru block may not be next any time we eliminate
+     forwarder blocks.  */
   if (! next)
     {
       for (e = bb->succ; e ; e = e->succ_next)
-	if (e->dest == bb->next_bb)
+	if (e->flags & EDGE_FALLTHRU)
 	  {
-	    if ((e->flags & EDGE_FALLTHRU)
-	        || (e->dest->succ
-	            && ! (e->flags & (EDGE_ABNORMAL_CALL | EDGE_EH))))
-	      next = e->dest;
+	    next = e->dest;
 	    break;
 	  }
+	else if (e->dest == bb->next_bb)
+	  {
+	    if (! (e->flags & (EDGE_ABNORMAL_CALL | EDGE_EH)))
+	      next = e->dest;
+	  }
     }
 
   /* Make sure we didn't select a silly next block.  */

gcc/cfglayout.c

@@ -608,10 +608,9 @@ verify_insn_chain ()
 }
 
 /* Remove any unconditional jumps and forwarder block creating fallthru
-   edges instead.  During BB reordering fallthru edges are not required
+   edges instead.  During BB reordering, fallthru edges are not required
    to target next basic block in the linear CFG layout, so the unconditional
-   jumps are not needed.  If LOOPS is not null, also update loop structure &
-   dominators.  */
+   jumps are not needed.  */
 
 static void
 cleanup_unconditional_jumps ()
@@ -636,7 +635,7 @@ cleanup_unconditional_jumps ()
 		fprintf (rtl_dump_file, "Removing forwarder BB %i\n",
 			 bb->index);
 
-	      redirect_edge_succ (bb->pred, bb->succ->dest);
+	      redirect_edge_succ_nodup (bb->pred, bb->succ->dest);
 	      flow_delete_block (bb);
 	      bb = prev;
 	    }
@@ -653,8 +652,6 @@ cleanup_unconditional_jumps ()
 	  else
 	    continue;
 
-	  /* Cleanup barriers and delete ADDR_VECs in a way as they are belonging
-             to removed tablejump anyway.  */
 	  insn = NEXT_INSN (bb->end);
 	  while (insn
 		 && (GET_CODE (insn) != NOTE
@@ -664,12 +661,6 @@ cleanup_unconditional_jumps ()
 
 	      if (GET_CODE (insn) == BARRIER)
 		delete_barrier (insn);
-	      else if (GET_CODE (insn) == JUMP_INSN)
-		delete_insn_chain (PREV_INSN (insn), insn);
-	      else if (GET_CODE (insn) == CODE_LABEL)
-		;
-	      else if (GET_CODE (insn) != NOTE)
-		abort ();
 
 	      insn = next;
 	    }

gcc/cfgrtl.c

@@ -963,9 +963,21 @@ force_nonfallthru_and_redirect (e, target)
   if (e->src->succ->succ_next)
     {
       /* Create the new structures.  */
+
+      /* Position the new block correctly relative to loop notes.  */
       note = last_loop_beg_note (e->src->end);
-      jump_block
-	= create_basic_block (NEXT_INSN (note), NULL, e->src);
+      note = NEXT_INSN (note);
+
+      /* ... and ADDR_VECs.  */
+      if (note != NULL
+	  && GET_CODE (note) == CODE_LABEL
+	  && NEXT_INSN (note)
+	  && GET_CODE (NEXT_INSN (note)) == JUMP_INSN
+	  && (GET_CODE (PATTERN (NEXT_INSN (note))) == ADDR_DIFF_VEC
+	      || GET_CODE (PATTERN (NEXT_INSN (note))) == ADDR_VEC))
+	note = NEXT_INSN (NEXT_INSN (note));
+
+      jump_block = create_basic_block (note, NULL, e->src);
       jump_block->count = e->count;
       jump_block->frequency = EDGE_FREQUENCY (e);
       jump_block->loop_depth = target->loop_depth;