gimple.c (gimple_call_same_target_p): Unique functions are eq.

	* gimple.c (gimple_call_same_target_p): Unique functions are eq.
	* tree-ssa-tail-merge.c (same_succ::equal): Check pointer eq
	equality first.

From-SVN: r235964

gcc/ChangeLog

+2016-05-06  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* gimple.c (gimple_call_same_target_p): Unique functions are eq.
+	* tree-ssa-tail-merge.c (same_succ::equal): Check pointer eq
+	equality first.
+
 2016-05-06  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/70948

gcc/gimple.c

@@ -1355,7 +1355,8 @@ gimple_call_same_target_p (const gimple *c1, const gimple *c2)
   if (gimple_call_internal_p (c1))
     return (gimple_call_internal_p (c2)
 	    && gimple_call_internal_fn (c1) == gimple_call_internal_fn (c2)
-	    && !gimple_call_internal_unique_p (as_a <const gcall *> (c1)));
+	    && (!gimple_call_internal_unique_p (as_a <const gcall *> (c1))
+		|| c1 == c2));
   else
     return (gimple_call_fn (c1) == gimple_call_fn (c2)
 	    || (gimple_call_fndecl (c1)

gcc/tree-ssa-tail-merge.c

@@ -538,6 +538,9 @@ same_succ::equal (const same_succ *e1, const same_succ *e2)
   gimple *s1, *s2;
   basic_block bb1, bb2;
 
+  if (e1 == e2)
+    return 1;
+
   if (e1->hashval != e2->hashval)
     return 0;