ipa-utils.c (ipa_merge_profiles): Fix updating of fnsummary; also handle…

ipa-utils.c (ipa_merge_profiles): Fix updating of fnsummary; also handle rescaling of mismatched profiles.


	* ipa-utils.c (ipa_merge_profiles): Fix updating of fnsummary;
	also handle rescaling of mismatched profiles.
	* ipa-fnsummary.c (analyze_function): Handle speculative edges.

From-SVN: r267392

gcc/ChangeLog

+2018-12-24  Jan Hubicka  <hubicka@ucw.cz>
+
+	* ipa-utils.c (ipa_merge_profiles): Fix updating of fnsummary;
+	also handle rescaling of mismatched profiles.
+	* ipa-fnsummary.c (analyze_function): Handle speculative edges.
+
 2018-12-23  Martin Sebor  <msebor@redhat.com>
 	    Jeff Law  <law@redhat.com>
 

gcc/ipa-fnsummary.c

@@ -2180,6 +2180,17 @@ analyze_function_body (struct cgraph_node *node, bool early)
 	      es->call_stmt_time = this_time;
 	      es->loop_depth = bb_loop_depth (bb);
 	      edge_set_predicate (edge, &bb_predicate);
+	      if (edge->speculative)
+		{
+		  cgraph_edge *direct, *indirect;
+		  ipa_ref *ref;
+		  edge->speculative_call_info (direct, indirect, ref);
+		  gcc_assert (direct == edge);
+	          ipa_call_summary *es2
+			 = ipa_call_summaries->get_create (indirect);
+		  ipa_call_summaries->duplicate (edge, indirect,
+						 es, es2);
+		}
 	    }
 
 	  /* TODO: When conditional jump or swithc is known to be constant, but
@@ -2491,7 +2502,8 @@ compute_fn_summary (struct cgraph_node *node, bool early)
      ipa_update_overall_fn_summary but because computation happens in
      different order the roundoff errors result in slight changes.  */
   ipa_update_overall_fn_summary (node);
-  gcc_assert (info->size == info->self_size);
+  /* In LTO mode we may have speculative edges set.  */
+  gcc_assert (in_lto_p || info->size == info->self_size);
 }
 
 

gcc/ipa-utils.c

@@ -392,6 +392,7 @@ ipa_merge_profiles (struct cgraph_node *dst,
   if (!src->definition
       || !dst->definition)
     return;
+
   if (src->frequency < dst->frequency)
     src->frequency = dst->frequency;
 
@@ -416,6 +417,8 @@ ipa_merge_profiles (struct cgraph_node *dst,
       fprintf (symtab->dump_file, "Merging profiles of %s to %s\n",
 	       src->dump_name (), dst->dump_name ());
     }
+  profile_count orig_count = dst->count;
+
   if (dst->count.initialized_p () && dst->count.ipa () == dst->count)
     dst->count += src->count.ipa ();
   else 
@@ -644,10 +647,21 @@ ipa_merge_profiles (struct cgraph_node *dst,
       if (!preserve_body)
         src->release_body ();
       /* Update summary.  */
-      symtab->call_cgraph_removal_hooks (dst);
-      symtab->call_cgraph_insertion_hooks (dst);
+      compute_fn_summary (dst, 0);
+    }
+  /* We can't update CFG profile, but we can scale IPA profile. CFG
+     will be scaled according to dst->count after IPA passes.  */
+  else
+    {
+      profile_count to = dst->count;
+      profile_count::adjust_for_ipa_scaling (&to, &orig_count);
+      struct cgraph_edge *e;
+      
+      for (e = dst->callees; e; e = e->next_callee)
+	e->count = e->count.apply_scale (to, orig_count);
+      for (e = dst->indirect_calls; e; e = e->next_callee)
+	e->count = e->count.apply_scale (to, orig_count);
     }
-  /* TODO: if there is no match, we can scale up.  */
   src->decl = oldsrcdecl;
 }