re PR tree-optimization/23584 (ipa-pure-const pass ignores dereferencing a volatile pointer type)

    PR middle-end/23584
    * gcc.dg/pr23584.c: New test.

From-SVN: r104284

gcc/testsuite/ChangeLog

+2005-09-14  Josh Conner  <jconner@apple.com>
+
+	PR middle-end/23584
+	* gcc.dg/pr23584.c: New test.
+
 2005-09-14  Jerry DeLisle  <jvdelisle@verizon.net>
 
 	PR fortran/21875 Internal Unit Array I/O, NIST

gcc/testsuite/gcc.dg/pr23584.c

+/* Regression test for PR middle-end/23584 */
+/* Verify that dereferencing an absolute address inside of a function
+   makes that function impure.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-ipa-pure-const" } */
+
+int test1 (void)
+{
+  return * (volatile int *) 0x1234;
+}
+
+int test2 (void)
+{
+  int local = * (volatile int *) 0x1234;
+  return local;
+}
+
+/* { dg-final { scan-ipa-dump-not "found to be pure: test1" "pure-const" } } */
+/* { dg-final { scan-ipa-dump-not "found to be pure: test2" "pure-const" } } */
+/* { dg-final { cleanup-ipa-dump "pure-const" } } */