From: Andrew MacLeod <amacleod@redhat.com>
Date: Wed, 28 Jul 2021 12:30:02 +0000 (-0400)
Subject: Return undefined on edges which are not executed.
X-Git-Tag: basepoints/gcc-13~5745
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=04600a47224b1ff85c6fb870218b51969cceff21;p=thirdparty%2Fgcc.git

Return undefined on edges which are not executed.

When a branch has been folded, mark any range requests on the unexecutable edge as
UNDEFINED.

	* gimple-range-gori.cc (gori_compute::outgoing_edge_range_p): Check for
	cond_false and cond_true on branches.
---

diff --git a/gcc/gimple-range-gori.cc b/gcc/gimple-range-gori.cc
index 17032acf8d7f..c124b3c1ce49 100644
--- a/gcc/gimple-range-gori.cc
+++ b/gcc/gimple-range-gori.cc
@@ -1104,6 +1104,21 @@ gori_compute::outgoing_edge_range_p (irange &r, edge e, tree name,
 
   fur_stmt src (stmt, &q);
 
+  // If this edge is never taken, return undefined.
+  gcond *gc = dyn_cast<gcond *> (stmt);
+  if (gc)
+    {
+      if (((e->flags & EDGE_TRUE_VALUE) && gimple_cond_false_p (gc))
+	  || ((e->flags & EDGE_FALSE_VALUE) && gimple_cond_true_p (gc)))
+	{
+	  r.set_undefined ();
+	  if (dump_file && (dump_flags & TDF_DETAILS))
+	      fprintf (dump_file, "Outgoing edge %d->%d unexecutable.\n",
+		       e->src->index, e->dest->index);
+	  return true;
+	}
+    }
+
   // If NAME can be calculated on the edge, use that.
   if (is_export_p (name, e->src))
     {