From 2c0eba5af00a2544e7e15bd8052a53bdb2b6f22f Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Wed, 22 Apr 2009 23:57:52 +0200
Subject: re PR c/39855 (Shift optimization discards operands' side effects)

	PR c/39855
	* fold-const.c (fold_binary) <case LSHIFT_EXPR>: When optimizing
	into 0, use omit_one_operand.

	* gcc.dg/torture/pr39855.c: New test.

From-SVN: r146617
---
 gcc/testsuite/ChangeLog                |  5 +++++
 gcc/testsuite/gcc.dg/torture/pr39855.c | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/torture/pr39855.c

(limited to 'gcc/testsuite')

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index e5c7010..7af7fcc 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2009-04-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/39855
+	* gcc.dg/torture/pr39855.c: New test.
+
 2009-04-22  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/39639
diff --git a/gcc/testsuite/gcc.dg/torture/pr39855.c b/gcc/testsuite/gcc.dg/torture/pr39855.c
new file mode 100644
index 0000000..6d75c38
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr39855.c
@@ -0,0 +1,24 @@
+/* PR c/39855 */
+/* { dg-do run { target { int32plus } } } */
+
+extern void abort (void);
+
+int i, j, k;
+
+int
+foo (void)
+{
+  return ++i;
+}
+
+int
+main ()
+{
+  if (__CHAR_BIT__ != 8 || sizeof (int) != 4)
+    return 0;
+  j = foo () << 30 << 2;
+  k = (unsigned) foo () >> 16 >> 16;
+  if (i != 2 || j != 0 || k != 0)
+    abort ();
+  return 0;
+}
-- 
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