From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu, 16 Oct 2008 12:32:01 +0000 (+0000)
Subject: 	PR tree-optimization/37664
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c2ffc126d31447d231dce2872700bbb415ec3af9;p=thirdparty%2Fgcc.git

	PR tree-optimization/37664
	* fold-const.c (fold_binary): When optimizing comparison with
	highest or lowest type's value, don't consider TREE_OVERFLOW.

	* gcc.c-torture/compile/pr37664.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@141171 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 13d987a712c6..b242191716ba 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2008-10-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/37664
+	* fold-const.c (fold_binary): When optimizing comparison with
+	highest or lowest type's value, don't consider TREE_OVERFLOW.
+
 2008-10-16  David Edelsohn  <edelsohn@gnu.org>
 
 	PR target/35483
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 0ce122a15545..605caa812e08 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -12447,7 +12447,6 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
 	unsigned int width = TYPE_PRECISION (arg1_type);
 
 	if (TREE_CODE (arg1) == INTEGER_CST
-	    && !TREE_OVERFLOW (arg1)
 	    && width <= 2 * HOST_BITS_PER_WIDE_INT
 	    && (INTEGRAL_TYPE_P (arg1_type) || POINTER_TYPE_P (arg1_type)))
 	  {
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index dd4544b61559..9148684b63c3 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2008-10-16  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/37664
+	* gcc.c-torture/compile/pr37664.c: New test.
+
 2008-10-16  Joseph Myers  <joseph@codesourcery.com>
 
 	PR middle-end/37418
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr37664.c b/gcc/testsuite/gcc.c-torture/compile/pr37664.c
new file mode 100644
index 000000000000..cf5c83d7b2de
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr37664.c
@@ -0,0 +1,14 @@
+/* PR tree-optimization/37664 */
+
+int v;
+
+int
+foo ()
+{
+  int a = 0x8899A862;
+  int b = 0x8E * a;
+  int c = (b % b);
+  if (v > (4294967295U >> c))
+    return v;
+  return 0;
+}