re PR tree-optimization/87672 (81512c36 causes ICE in bootstrap stage 3 using…

re PR tree-optimization/87672 (81512c36 causes ICE in bootstrap stage 3 using "-D_FORTIFY_SOURCE=2"   (invalid operand in unary operation, incorrect sharing of tree nodes, verify_gimple failed))

gcc:
2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR tree-optimization/87672
        * gimple-fold.c (gimple_fold_builtin_stxcpy_chk): Gimplify.
        * tree-ssa-strlen.c (handle_builtin_strcat): Adjust object size.

testsuite:
2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR tree-optimization/87672
        * gcc.dg/pr87672.c: New test.

From-SVN: r265777

gcc/ChangeLog

+2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	PR tree-optimization/87672
+	* gimple-fold.c (gimple_fold_builtin_stxcpy_chk): Gimplify.
+	* tree-ssa-strlen.c (handle_builtin_strcat): Adjust object size.
+
 2018-11-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR middle-end/58372

gcc/gimple-fold.c

@@ -2715,6 +2715,7 @@ gimple_fold_builtin_stxcpy_chk (gimple_stmt_iterator *gsi,
 		return false;
 
 	      gimple_seq stmts = NULL;
+	      len = force_gimple_operand (len, &stmts, true, NULL_TREE);
 	      len = gimple_convert (&stmts, loc, size_type_node, len);
 	      len = gimple_build (&stmts, loc, PLUS_EXPR, size_type_node, len,
 				  build_int_cst (size_type_node, 1));

gcc/testsuite/ChangeLog

+2018-11-04  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	PR tree-optimization/87672
+	* gcc.dg/pr87672.c: New test.
+
 2018-11-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR middle-end/58372

gcc/testsuite/gcc.dg/pr87672.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+char buf[40];
+void test (int x)
+{
+  __builtin_strcpy (buf, "test");
+  __builtin___strcat_chk (buf, "postfix" + x, sizeof (buf));
+}
+
+/* { dg-final { scan-tree-dump "memcpy_chk.*, 36\\)" "optimized" } } */

gcc/tree-ssa-strlen.c

@@ -2605,12 +2605,19 @@ handle_builtin_strcat (enum built_in_function bcode, gimple_stmt_iterator *gsi)
   if (endptr)
     dst = fold_convert_loc (loc, TREE_TYPE (dst), unshare_expr (endptr));
   else
-    dst = fold_build2_loc (loc, POINTER_PLUS_EXPR,
-			   TREE_TYPE (dst), unshare_expr (dst),
+    dst = fold_build2_loc (loc, POINTER_PLUS_EXPR, TREE_TYPE (dst), dst,
 			   fold_convert_loc (loc, sizetype,
 					     unshare_expr (dstlen)));
   dst = force_gimple_operand_gsi (gsi, dst, true, NULL_TREE, true,
 				  GSI_SAME_STMT);
+  if (objsz)
+    {
+      objsz = fold_build2_loc (loc, MINUS_EXPR, TREE_TYPE (objsz), objsz,
+			       fold_convert_loc (loc, TREE_TYPE (objsz),
+						 unshare_expr (dstlen)));
+      objsz = force_gimple_operand_gsi (gsi, objsz, true, NULL_TREE, true,
+					GSI_SAME_STMT);
+    }
   if (dump_file && (dump_flags & TDF_DETAILS) != 0)
     {
       fprintf (dump_file, "Optimizing: ");