From 96f6dc9fc50b1cc59e26d50940ebf46e1bdcc0ba Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Thu, 18 Oct 2018 11:17:05 +0200
Subject: [PATCH] Avoid triggering undefined behaviour in
 base_uint<BITS>::bits()

---
 src/arith_uint256.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/arith_uint256.cpp b/src/arith_uint256.cpp
index 13fa176f8bf..791dad7a605 100644
--- a/src/arith_uint256.cpp
+++ b/src/arith_uint256.cpp
@@ -176,7 +176,7 @@ unsigned int base_uint<BITS>::bits() const
     for (int pos = WIDTH - 1; pos >= 0; pos--) {
         if (pn[pos]) {
             for (int nbits = 31; nbits > 0; nbits--) {
-                if (pn[pos] & 1 << nbits)
+                if (pn[pos] & 1U << nbits)
                     return 32 * pos + nbits + 1;
             }
             return 32 * pos + 1;