http://bugzilla.novell.com/show_bug.cgi?id=586664
http://bugzilla.novell.com/show_bug.cgi?id=586664#c0 Summary: Incorrect values in array after very basic operations Classification: Mono Product: Mono: Runtime Version: 2.4.x Platform: 64bit OS/Version: Ubuntu Status: NEW Severity: Critical Priority: P5 - None Component: JIT AssignedTo: [email protected] ReportedBy: [email protected] QAContact: [email protected] Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100215 Linux Mint/7 (Gloria) Shiretoko/3.5.7 OS: Ubuntu Karmic 64-bit Mono: Mono JIT compiler version 2.4.2.3 (Debian 2.4.2.3+dfsg-2) (I also tried version 2.6.1 - had trouble installing it from source, but the bug seems to exsist there too) The bug does not exist in Mono: 2.0.1 Example code: using System; namespace BugTest { class MainClass { public static void Main (string[] args) { double nb = 1.0 / Math.Pow(2, 1); // nb == 1.0 / 2.0 == 0.5 double[] arr = new double[2] { -nb, -nb }; // arr[0] == -0.5, arr[1] == -0.5 Console.WriteLine("nb = " + nb); // ok Console.WriteLine("arr[0] = " + arr[0]); // ERROR! arr[0] suddenly equals -2 Console.WriteLine("arr[1] = " + arr[1]); // ok } } } Reproducible: Always Steps to Reproduce: 1. Just run the code posted in Details 2. 3. Actual Results: The code outputs: nb = 0.5 arr[0] = -2 arr[1] = -0.5 Expected Results: The code should output: nb = 0.5 arr[0] = -0.5 arr[1] = -0.5 Only running the code as it is produces this bug. Changing anything makes the bug disappear. - run the code with a debugger under Monodevelop and the bug is gone - Replace "Math.Pow(2, 1)" by "2.0" and the bug is gone - Replace "double[] arr = new double[2] { -nb, -nb };" by double[] arr = new double[2]; arr[0] = -nb; arr[1] = -nb; and this also gets rid of the bug. -- Configure bugmail: http://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug. _______________________________________________ mono-bugs maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-bugs
