1 files changed, 12 insertions, 7 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 02570b7..21121b2 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -8036,21 +8036,26 @@ find_compatible_field (tree record, tree orig_field)
   return orig_field;
 }
 
-/* Return value of a constant X.  */
+/* Return value of a constant X and sign-extend it.  */
 
 HOST_WIDE_INT
 int_cst_value (const_tree x)
 {
   unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
   unsigned HOST_WIDE_INT val = TREE_INT_CST_LOW (x);
-  bool negative = ((val >> (bits - 1)) & 1) != 0;
 
-  gcc_assert (bits <= HOST_BITS_PER_WIDE_INT);
+  /* Make sure the sign-extended value will fit in a HOST_WIDE_INT.  */
+  gcc_assert (TREE_INT_CST_HIGH (x) == 0
+	      || TREE_INT_CST_HIGH (x) == -1);
 
-  if (negative)
-    val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
-  else
-    val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
+  if (bits < HOST_BITS_PER_WIDE_INT)
+    {
+      bool negative = ((val >> (bits - 1)) & 1) != 0;
+      if (negative)
+	val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
+      else
+	val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
+    }
 
   return val;
 }