re PR middle-end/60175 (ICE on gcc.dg/asan/nosanitize-and-inline.c)

	PR middle-end/60175
	* function.c (expand_function_end): Don't emit
	clobber_return_register sequence if clobber_after is a BARRIER.
	* cfgexpand.c (construct_exit_block): Append instructions before
	return_label to prev_bb.

From-SVN: r208267

gcc/ChangeLog

+2014-03-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/60175
+	* function.c (expand_function_end): Don't emit
+	clobber_return_register sequence if clobber_after is a BARRIER.
+	* cfgexpand.c (construct_exit_block): Append instructions before
+	return_label to prev_bb.
+
 2014-03-02  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* config/rs6000/constraints.md: Document reserved use of "wc".

gcc/cfgexpand.c

@@ -5273,7 +5273,8 @@ construct_exit_block (void)
   edge e, e2;
   unsigned ix;
   edge_iterator ei;
-  rtx orig_end = BB_END (EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb);
+  basic_block prev_bb = EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb;
+  rtx orig_end = BB_END (prev_bb);
 
   rtl_profile_for_bb (EXIT_BLOCK_PTR_FOR_FN (cfun));
 
@@ -5288,13 +5289,25 @@ construct_exit_block (void)
   end = get_last_insn ();
   if (head == end)
     return;
-  /* While emitting the function end we could move end of the last basic block.
-   */
-  BB_END (EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb) = orig_end;
+  /* While emitting the function end we could move end of the last basic
+     block.  */
+  BB_END (prev_bb) = orig_end;
   while (NEXT_INSN (head) && NOTE_P (NEXT_INSN (head)))
     head = NEXT_INSN (head);
-  exit_block = create_basic_block (NEXT_INSN (head), end,
-				   EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb);
+  /* But make sure exit_block starts with RETURN_LABEL, otherwise the
+     bb frequency counting will be confused.  Any instructions before that
+     label are emitted for the case where PREV_BB falls through into the
+     exit block, so append those instructions to prev_bb in that case.  */
+  if (NEXT_INSN (head) != return_label)
+    {
+      while (NEXT_INSN (head) != return_label)
+	{
+	  if (!NOTE_P (NEXT_INSN (head)))
+	    BB_END (prev_bb) = NEXT_INSN (head);
+	  head = NEXT_INSN (head);
+	}
+    }
+  exit_block = create_basic_block (NEXT_INSN (head), end, prev_bb);
   exit_block->frequency = EXIT_BLOCK_PTR_FOR_FN (cfun)->frequency;
   exit_block->count = EXIT_BLOCK_PTR_FOR_FN (cfun)->count;
   if (current_loops && EXIT_BLOCK_PTR_FOR_FN (cfun)->loop_father)

gcc/function.c

@@ -5156,17 +5156,20 @@ expand_function_end (void)
       crtl->return_rtx = outgoing;
     }
 
-  /* Emit the actual code to clobber return register.  */
-  {
-    rtx seq;
+  /* Emit the actual code to clobber return register.  Don't emit
+     it if clobber_after is a barrier, then the previous basic block
+     certainly doesn't fall thru into the exit block.  */
+  if (!BARRIER_P (clobber_after))
+    {
+      rtx seq;
 
-    start_sequence ();
-    clobber_return_register ();
-    seq = get_insns ();
-    end_sequence ();
+      start_sequence ();
+      clobber_return_register ();
+      seq = get_insns ();
+      end_sequence ();
 
-    emit_insn_after (seq, clobber_after);
-  }
+      emit_insn_after (seq, clobber_after);
+    }
 
   /* Output the label for the naked return from the function.  */
   if (naked_return_label)