re PR middle-end/63237 (error: invalid operand in unary operation)

2014-09-12  Richard Biener  <rguenther@suse.de>

	PR middle-end/63237
	* gimple-fold.c (get_maxval_strlen): Gimplify string length.

	* g++.dg/torture/pr63237.C: New testcase.

From-SVN: r215212

gcc/ChangeLog

+2014-09-12  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/63237
+	* gimple-fold.c (get_maxval_strlen): Gimplify string length.
+
 2014-09-12  Marc Glisse  <marc.glisse@inria.fr>
 
 	* tree.c (integer_each_onep): New function.

gcc/gimple-fold.c

@@ -2411,6 +2411,7 @@ gimple_fold_builtin_strlen (gimple_stmt_iterator *gsi)
   tree len = get_maxval_strlen (gimple_call_arg (stmt, 0), 0);
   if (!len)
     return false;
+  len = force_gimple_operand_gsi (gsi, len, true, NULL, true, GSI_SAME_STMT);
   replace_call_with_value (gsi, len);
   return true;
 }

gcc/testsuite/ChangeLog

+2014-09-12  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/63237
+	* g++.dg/torture/pr63237.C: New testcase.
+
 2014-09-12  Marc Glisse  <marc.glisse@inria.fr>
 
 	* gcc.dg/vec-andxor1.c: New file.

gcc/testsuite/g++.dg/torture/pr63237.C

+// { dg-do compile }
+
+class A {
+    int Length;
+public:
+    A(const char *p1) { Length = __builtin_strlen(p1); }
+};
+class B {
+public:
+    void m_fn1(int, A);
+};
+class C {
+public:
+    B &m_fn2();
+};
+int a;
+void RewriteMacrosInInput() {
+    C b;
+    B &c = b.m_fn2();
+    c.m_fn1(0, &""[a]);
+}