Added testcase for PR 83329

2017-12-19  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/83329
	* gcc.dg/tree-ssa/pr83329.c: New test

From-SVN: r255814

gcc/testsuite/ChangeLog

+2017-12-19  Martin Jambor  <mjambor@suse.cz>
+
+	PR tree-optimization/83329
+	* gcc.dg/tree-ssa/pr83329.c: New test
+
 2017-12-19  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/79490

gcc/testsuite/gcc.dg/tree-ssa/pr83329.c

+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+typedef struct {
+  long a;
+  long b;
+} c;
+
+c *d;
+char e, f, g;
+void h() {
+  d[0].a = &g - &f;
+  d[0].b = &e - &f;
+}