Update src/libraries/System.Private.CoreLib/src/System/UInt128.cs

Co-authored-by: Günther Foidl <gue@korporal.at>
dotnet · Mar 14, 2024 · f236089 · f236089
1 parent a032637
commit f236089
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/src/libraries/System.Private.CoreLib/src/System/UInt128.cs b/src/libraries/System.Private.CoreLib/src/System/UInt128.cs
@@ -1104,9 +1104,10 @@ public static UInt128 Log2(UInt128 value)
                     ulong highRes = 0ul;
                     ulong remainder = left._upper;
 
-                    // We might need 2 division to avoid overflow
                     if (remainder >= right._lower)
-                        (highRes, remainder) = X86Base.X64.DivRem(remainder, 0, right._lower);
+                    {
+                        (highRes, remainder) = X86Base.X64.DivRem(left._upper, 0, right._lower);
+                    }
 
                     return new UInt128(highRes, X86Base.X64.DivRem(left._lower, remainder, right._lower).Quotient);
                 }