From 1f4eb0e985e71a20e5778963cf98e591054dd51b Mon Sep 17 00:00:00 2001
From: Jan Hubicka <hubicka@ucw.cz>
Date: Thu, 26 Mar 2015 20:56:25 +0100
Subject: [PATCH] cgraph.c (cgraph_update_edges_for_call_stmt_node): Do not
 bring dead calls back to live.

	* cgraph.c (cgraph_update_edges_for_call_stmt_node): Do not bring
	dead calls back to live.
	(cgraph_edge::verify_count_and_frequency): Move cgraph/cfg frequency
	cross check to ...
	(cgraph_node::verify_node): ... here; verify only callee edges,
	not caller.

From-SVN: r221707
---
 gcc/ChangeLog |  9 +++++++
 gcc/cgraph.c  | 69 +++++++++++++++++++++++++++++++++++----------------
 2 files changed, 57 insertions(+), 21 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d9b125ec7ff..896477060ef 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2015-03-26  Jan Hubicka  <hubicka@ucw.cz>
+
+	* cgraph.c (cgraph_update_edges_for_call_stmt_node): Do not bring
+	dead calls back to live.
+	(cgraph_edge::verify_count_and_frequency): Move cgraph/cfg frequency
+	cross check to ...
+	(cgraph_node::verify_node): ... here; verify only callee edges,
+	not caller.
+
 2015-03-26  Jan Hubicka  <hubicka@ucw.cz>
 
 	* ipa-inline-analysis.c (redirect_to_unreachable): New function.
diff --git a/gcc/cgraph.c b/gcc/cgraph.c
index 35164f9f406..0d2b826a5e7 100644
--- a/gcc/cgraph.c
+++ b/gcc/cgraph.c
@@ -1515,6 +1515,15 @@ cgraph_update_edges_for_call_stmt_node (cgraph_node *node,
 
       if (e)
 	{
+	  /* Keep calls marked as dead dead.  */
+	  if (e->callee
+	      && DECL_BUILT_IN_CLASS (e->callee->decl) == BUILT_IN_NORMAL
+	      && DECL_FUNCTION_CODE (e->callee->decl) == BUILT_IN_UNREACHABLE)
+	    {
+              node->get_edge (old_stmt)->set_call_stmt
+		 (as_a <gcall *> (new_stmt));
+	      return;
+	    }
 	  /* See if the edge is already there and has the correct callee.  It
 	     might be so because of indirect inlining has already updated
 	     it.  We also might've cloned and redirected the edge.  */
@@ -2661,25 +2670,6 @@ cgraph_edge::verify_count_and_frequency ()
       error ("caller edge frequency is too large");
       error_found = true;
     }
-  if (gimple_has_body_p (caller->decl)
-      && !caller->global.inlined_to
-      && !speculative
-      /* FIXME: Inline-analysis sets frequency to 0 when edge is optimized out.
-	 Remove this once edges are actually removed from the function at that time.  */
-      && (frequency
-	  || (inline_edge_summary_vec.exists ()
-	      && ((inline_edge_summary_vec.length () <= (unsigned) uid)
-	          || !inline_edge_summary (this)->predicate)))
-      && (frequency
-	  != compute_call_stmt_bb_frequency (caller->decl,
-					     gimple_bb (call_stmt))))
-    {
-      error ("caller edge frequency %i does not match BB frequency %i",
-	     frequency,
-	     compute_call_stmt_bb_frequency (caller->decl,
-					     gimple_bb (call_stmt)));
-      error_found = true;
-    }
   return error_found;
 }
 
@@ -2848,9 +2838,46 @@ cgraph_node::verify_node (void)
 	    error_found = true;
 	  }
     }
+  for (e = callees; e; e = e->next_callee)
+    {
+      if (e->verify_count_and_frequency ())
+	error_found = true;
+      if (gimple_has_body_p (e->caller->decl)
+	  && !e->caller->global.inlined_to
+	  && !e->speculative
+	  /* Optimized out calls are redirected to __builtin_unreachable.  */
+	  && (e->frequency
+	      || e->callee->decl
+		 != builtin_decl_implicit (BUILT_IN_UNREACHABLE))
+	  && (e->frequency
+	      != compute_call_stmt_bb_frequency (e->caller->decl,
+						 gimple_bb (e->call_stmt))))
+	{
+	  error ("caller edge frequency %i does not match BB frequency %i",
+		 e->frequency,
+		 compute_call_stmt_bb_frequency (e->caller->decl,
+						 gimple_bb (e->call_stmt)));
+	  error_found = true;
+	}
+    }
   for (e = indirect_calls; e; e = e->next_callee)
-    if (e->verify_count_and_frequency ())
-      error_found = true;
+    {
+      if (e->verify_count_and_frequency ())
+	error_found = true;
+      if (gimple_has_body_p (e->caller->decl)
+	  && !e->caller->global.inlined_to
+	  && !e->speculative
+	  && (e->frequency
+	      != compute_call_stmt_bb_frequency (e->caller->decl,
+						 gimple_bb (e->call_stmt))))
+	{
+	  error ("indirect call frequency %i does not match BB frequency %i",
+		 e->frequency,
+		 compute_call_stmt_bb_frequency (e->caller->decl,
+						 gimple_bb (e->call_stmt)));
+	  error_found = true;
+	}
+    }
   if (!callers && global.inlined_to)
     {
       error ("inlined_to pointer is set but no predecessors found");
-- 
2.30.2