Fixed comments.

[r28374]

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index 61df3ce..26f178f 100644 (file)
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -556,16 +556,16 @@ static ir_tarval *do_computed_value_Div(const ir_node *div)
        ir_tarval     *tb;
        const ir_node *dummy;
 
+       /* cannot optimize 0 / b = 0 because of NaN */
        if (!mode_is_float(mode)) {
-               /* Compute c1 / c2 or 0 / a, a != 0 */
                if (tarval_is_null(ta) && value_not_zero(b, &dummy))
-                       return ta;  /* 0 / b == 0 */
+                       return ta;  /* 0 / b == 0 if b != 0 */
        }
        tb = value_of(b);
        if (ta != tarval_bad && tb != tarval_bad)
                return tarval_div(ta, tb);
        return tarval_bad;
-}  /* do_computed_value_integer_Div */
+}  /* do_computed_value_Div */
 
 /**
  * Calculate the value of an integer Mod of two nodes.