From: Martin Liska <mliska@suse.cz>
Date: Thu, 27 Jul 2017 12:53:34 +0000 (+0200)
Subject: Initialize counters in autoFDO to zero, not to uninitialized.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b8163af7d91c2f5a4158a5cb6e6555b375e61ea4;p=gcc.git

Initialize counters in autoFDO to zero, not to uninitialized.

2017-07-27  Martin Liska  <mliska@suse.cz>

	* auto-profile.c (afdo_annotate_cfg): Assign zero counts to
	BBs and edges seen by autoFDO.

From-SVN: r250621
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5fcaae2eba6..cf39fdaec7c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2017-07-27  Martin Liska  <mliska@suse.cz>
+
+	* auto-profile.c (afdo_annotate_cfg): Assign zero counts to
+	BBs and edges seen by autoFDO.
+
 2017-07-27  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/81502
diff --git a/gcc/auto-profile.c b/gcc/auto-profile.c
index 71c06f30449..552e3331b15 100644
--- a/gcc/auto-profile.c
+++ b/gcc/auto-profile.c
@@ -1547,9 +1547,11 @@ afdo_annotate_cfg (const stmt_set &promoted_stmts)
     edge e;
     edge_iterator ei;
 
-    bb->count = profile_count::uninitialized ();
+    /* As autoFDO uses sampling approach, we have to assume that all
+       counters are zero when not seen by autoFDO.  */
+    bb->count = profile_count::zero ().afdo ();
     FOR_EACH_EDGE (e, ei, bb->succs)
-      e->count = profile_count::uninitialized ();
+      e->count = profile_count::zero ().afdo ();
 
     if (afdo_set_bb_count (bb, promoted_stmts))
       set_bb_annotated (bb, &annotated_bb);