1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/expr.c b/gcc/expr.c
index ee11142..0f20372 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -8037,7 +8037,15 @@ expand_expr_real_2 (sepops ops, rtx target, enum machine_mode tmode,
 			 VOIDmode, EXPAND_NORMAL);
       if (modifier == EXPAND_STACK_PARM)
 	target = 0;
-      temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
+      /* In case we have to reduce the result to bitfield precision
+	 expand this as XOR with a proper constant instead.  */
+      if (reduce_bit_field)
+	temp = expand_binop (mode, xor_optab, op0,
+			     immed_double_int_const
+			       (double_int_mask (TYPE_PRECISION (type)), mode),
+			     target, 1, OPTAB_LIB_WIDEN);
+      else
+	temp = expand_unop (mode, one_cmpl_optab, op0, target, 1);
       gcc_assert (temp);
       return temp;