Use the `get_previous_power_of_2` function in ethereum/eth2.0-specs#1323

2019-08-15 16:14:07 +08:00 · 2019-08-15 16:14:07 +08:00 · 0f52d460a5
parent d88a83d482
commit 0f52d460a5
1 changed files with 1 additions and 2 deletions
--- a/specs/light_client/merkle_proofs.md
+++ b/specs/light_client/merkle_proofs.md
@ -50,8 +50,7 @@ def get_previous_power_of_two(x: int) -> int:
    """
    Get the previous power of 2 >= the input.
    """
-    assert x >= 2
-    return get_next_power_of_two(x) // 2
+    return x if x <= 2 else 2 * get_previous_power_of_2(x // 2)
 ```

 ## Generalized Merkle tree index