1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr23584.c b/gcc/testsuite/gcc.dg/pr23584.c
new file mode 100644
index 000000000..691a11956
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr23584.c
@@ -0,0 +1,21 @@
+/* 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" } } */