From a325b0be7e695e310454331adb668288af8dd2a9 Mon Sep 17 00:00:00 2001
From: Josh Conner <jconner@apple.com>
Date: Wed, 14 Sep 2005 21:34:37 +0000
Subject: [PATCH] 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        |  5 +++++
 gcc/testsuite/gcc.dg/pr23584.c | 21 +++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/pr23584.c

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 94ae3be09142..c74bd24dbedd 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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
diff --git a/gcc/testsuite/gcc.dg/pr23584.c b/gcc/testsuite/gcc.dg/pr23584.c
new file mode 100644
index 000000000000..691a11956bad
--- /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" } } */
-- 
2.47.2