4 files changed, 34 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index db870ff..35af4ec 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-03-30  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/70450
+	* fold-const.c (extract_muldiv_1): Fix thinko in wide_int::from
+	usage.
+
 2016-03-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/70421
diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 44fe2a2..788ecc3 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -6375,8 +6375,10 @@ extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type,
 	  bool overflow_mul_p;
 	  signop sign = TYPE_SIGN (ctype);
 	  unsigned prec = TYPE_PRECISION (ctype);
-	  wide_int mul = wi::mul (wide_int::from (op1, prec, sign),
-				  wide_int::from (c, prec, sign),
+	  wide_int mul = wi::mul (wide_int::from (op1, prec,
+						  TYPE_SIGN (TREE_TYPE (op1))),
+				  wide_int::from (c, prec,
+						  TYPE_SIGN (TREE_TYPE (c))),
 				  sign, &overflow_mul_p);
 	  overflow_p = TREE_OVERFLOW (c) | TREE_OVERFLOW (op1);
 	  if (overflow_mul_p
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index b2dfebf..658e6c5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2016-03-30  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/70450
+	* gcc.dg/torture/pr70450.c: New testcase.
+
 2016-03-30  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/70421
diff --git a/gcc/testsuite/gcc.dg/torture/pr70450.c b/gcc/testsuite/gcc.dg/torture/pr70450.c
new file mode 100644
index 0000000..ee5e24d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr70450.c
@@ -0,0 +1,19 @@
+/* { dg-do run } */
+/* { dg-require-effective-target lp64 } */
+
+unsigned long int a = 2UL;
+int b = 2;
+unsigned long int c = 2UL;
+
+void foo ()
+{
+  c = 2 * ((2 * a) * (2 * (-b)));
+}
+
+int main ()
+{
+  foo();
+  if (c != 18446744073709551584UL)
+    __builtin_abort();
+  return 0;
+}