re PR tree-optimization/91236 (ICE in walk_non_aliased_vuses at…

re PR tree-optimization/91236 (ICE in walk_non_aliased_vuses at gcc/tree-ssa-alias.c:3395 on aarch64)

2019-07-25  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91236
	* tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Fix
	size of CONSTRUCTOR write.  Fix buffer size we pass to
	native_encode_expr.

From-SVN: r273787

gcc/ChangeLog

+2019-07-25  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/91236
+	* tree-ssa-sccvn.c (vn_walk_cb_data::push_partial_def): Fix
+	size of CONSTRUCTOR write.  Fix buffer size we pass to
+	native_encode_expr.
+
 2019-07-24  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
 
 	* config.gcc (msp430*-*-*): Fix non-GNU style in r273774.

gcc/tree-ssa-sccvn.c

@@ -1818,7 +1818,7 @@ vn_walk_cb_data::push_partial_def (const pd_data &pd, tree vuse,
       if (TREE_CODE (pd.rhs) == CONSTRUCTOR)
 	/* Empty CONSTRUCTOR.  */
 	memset (buffer + MAX (0, pd.offset),
-		0, MIN ((HOST_WIDE_INT)sizeof (buffer),
+		0, MIN ((HOST_WIDE_INT)sizeof (buffer) - MAX (0, pd.offset),
 			pd.size + MIN (0, pd.offset)));
       else
 	{
@@ -1833,7 +1833,7 @@ vn_walk_cb_data::push_partial_def (const pd_data &pd, tree vuse,
 	      pad = GET_MODE_SIZE (mode) - pd.size;
 	    }
 	  len = native_encode_expr (pd.rhs, buffer + MAX (0, pd.offset),
-				    sizeof (buffer - MAX (0, pd.offset)),
+				    sizeof (buffer) - MAX (0, pd.offset),
 				    MAX (0, -pd.offset) + pad);
 	  if (len <= 0 || len < (pd.size - MAX (0, -pd.offset)))
 	    {