Use IndexOfAnyExcept in BigInteger.IsPowerOfTwo (#104513)

* Use IndexOfAnyExcept in BigInteger.IsPowerOfTwo * Use ContainsAnyExcept
dotnet · Jul 9, 2024 · ce2f85b · ce2f85b
1 parent 01dbf51
commit ce2f85b
Showing 1 changed file with 3 additions and 8 deletions.
diff --git a/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs b/src/libraries/System.Runtime.Numerics/src/System/Numerics/BigInteger.cs
@@ -637,15 +637,10 @@ public bool IsPowerOfTwo
 
                 if (_sign != 1)
                     return false;
+
                 int iu = _bits.Length - 1;
-                if (!BitOperations.IsPow2(_bits[iu]))
-                    return false;
-                while (--iu >= 0)
-                {
-                    if (_bits[iu] != 0)
-                        return false;
-                }
-                return true;
+
+                return BitOperations.IsPow2(_bits[iu]) && !_bits.AsSpan(0, iu).ContainsAnyExcept(0u);
             }
         }