From: Richard Biener <rguenther@suse.de>
Date: Fri, 24 Sep 2021 08:13:45 +0000 (+0200)
Subject: Verify unallocated edge/BB flags are clear
X-Git-Tag: upstream/12.2.0~4819
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=710c6ab4ad502cddc8bdf82c95f580fa94fbf9fb;p=platform%2Fupstream%2Fgcc.git

Verify unallocated edge/BB flags are clear

This adds verification that unused auto_{edge,bb}_flag are not
remaining set but correctly cleared by consumers.  The intent
is that those flags can be cheaply used on a smaller IL region
and thus afterwards clearing can be restricted to the same
small region as well.

2021-09-24  Richard Biener  <rguenther@suse.de>

	* cfghooks.c (verify_flow_info): Verify unallocated BB and
	edge flags are not set.
---

diff --git a/gcc/cfghooks.c b/gcc/cfghooks.c
index 50b9b17..6446e16 100644
--- a/gcc/cfghooks.c
+++ b/gcc/cfghooks.c
@@ -161,6 +161,12 @@ verify_flow_info (void)
 	  err = 1;
 	}
 
+      if (bb->flags & ~cfun->cfg->bb_flags_allocated)
+	{
+	  error ("verify_flow_info: unallocated flag set on BB %d", bb->index);
+	  err = 1;
+	}
+
       FOR_EACH_EDGE (e, ei, bb->succs)
 	{
 	  if (last_visited [e->dest->index] == bb)
@@ -202,6 +208,13 @@ verify_flow_info (void)
 	      err = 1;
 	    }
 
+	  if (e->flags & ~cfun->cfg->edge_flags_allocated)
+	    {
+	      error ("verify_flow_info: unallocated edge flag set on %d -> %d",
+		     e->src->index, e->dest->index);
+	      err = 1;
+	    }
+
 	  edge_checksum[e->dest->index] += (size_t) e;
 	}
       if (n_fallthru > 1)