doubles performance

AnthonyLloyd · Nov 30, 2023 · fd68d1c · fd68d1c
1 parent 09dff27
commit fd68d1c
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Showing 2 changed files with 12 additions and 1 deletion.
diff --git a/CsCheck/Check.cs b/CsCheck/Check.cs
@@ -3222,7 +3222,8 @@ public override string ToString()
             spinLock.Enter(ref lockTaken);
             if (!processing)
             {
-                var result = $"{Median.Median * 100.0:#0.00}%[{Median.Q1 * 100.0:#0.00}%..{Median.Q3 * 100.0:#0.00}%] {(Median.Median >= 0.0 ? "faster" : "slower")}";
+                var times = 1 / (1 - Math.Abs(Median.Median));
+                var result = $"{Median.Median * 100.0:#0.00}%[{Median.Q1 * 100.0:#0.00}%..{Median.Q3 * 100.0:#0.00}%] {times:#0.00}x {(Median.Median >= 0.0 ? "faster" : "slower")}";
                 if (double.IsNaN(Median.Median)) result = $"Time resolution too small try using repeat.\n{result}";
                 else if ((Median.Median >= 0.0) != (Faster > Slower)) result = $"Inconsistent result try using repeat or increasing sigma.\n{result}";
                 result = $"{result}, sigma={Math.Sqrt(SigmaSquared):#0.0} ({Faster:#,0} vs {Slower:#,0})";

diff --git a/Tests/FloatingPointTests.cs b/Tests/FloatingPointTests.cs
@@ -30,6 +30,16 @@ public void DoubleSupportsRoundtripPrecisionTo15()
         }, writeLine: output.WriteLine);
     }
 
+    [Fact]
+    public void X()
+    {
+        var quantity = 1000;
+        var price = 99.99;
+        var fxRate = 1.2345;
+        var localValue = MathX.TwoMul(quantity, price, out double lo1);
+        var usdValue = MathX.TwoMul(localValue, fxRate, out double lo2);
+    }
+
     private static void DoubleSumPrecision(int significantFigures, int maxLength)
     {
         const double scaling = 0.01;