ipa/98330 - avoid ICEing on call indirect call

The following avoids ICEing on a indirect calls with a fnspec
in modref analysis.

2021-01-19  Richard Biener  <rguenther@suse.de>

	PR ipa/98330
	* ipa-modref.c (analyze_stmt): Only record a summary for a
	direct call.

	* g++.dg/pr98330.C: New testcase.
	* gcc.dg/pr98330.c: Likewise.

gcc/ipa-modref.c

@@ -1247,11 +1247,13 @@ analyze_stmt (modref_summary *summary, modref_summary_lto *summary_lto,
 	    && (!fnspec.global_memory_read_p ()
 		|| !fnspec.global_memory_written_p ()))
 	  {
-	    fnspec_summaries->get_create
-		 (cgraph_node::get (current_function_decl)->get_edge (stmt))
-			->fnspec = xstrdup (fnspec.get_str ());
-	    if (dump_file)
-	      fprintf (dump_file, "  Recorded fnspec %s\n", fnspec.get_str ());
+	    cgraph_edge *e = cgraph_node::get (current_function_decl)->get_edge (stmt);
+	    if (e->callee)
+	      {
+		fnspec_summaries->get_create (e)->fnspec = xstrdup (fnspec.get_str ());
+		if (dump_file)
+		  fprintf (dump_file, "  Recorded fnspec %s\n", fnspec.get_str ());
+	      }
 	  }
       }
      return true;

gcc/testsuite/g++.dg/pr98330.C

@@ -0,0 +1,7 @@
+// { dg-do compile }
+// { dg-options -O2 }
+
+float f (float x)
+{
+  return __builtin_pow[1] (x, 2); // { dg-warning "pointer to a function used in arithmetic" }
+}

gcc/testsuite/gcc.dg/pr98330.c

@@ -0,0 +1,7 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+float f (__typeof (__builtin_pow) fn, float x)
+{
+  return fn (x, 2);
+}