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    <p>FWIW, on mono 2.8+ both return values are False, outputting</p> <pre><code>False False </code></pre> <p>Amazingly, csc.exe from VS2010 produces different results, indeed, outputting:</p> <pre><code>False True </code></pre> <p>Even more interestingly, the problem <strong>appears <em>not</em> with the generated IL code</strong>, but with the Framework implementation/JIT engine; </p> <ul> <li>executing the MS-compiled image with the Mono VM results in <code>False/False</code>, like the mono compiled version</li> <li>executing the Mono-compiled image with the MS VM results in <code>False/True</code>, like the MS compiled version</li> </ul> <hr> <p>For your interest, here are the disassemblies of Microsoft's CSC.exe compiler (<code>csc.exe /optimize+ test.cs</code>):</p> <pre><code>.method private static hidebysig default bool Compare&lt;T&gt; (!!T x, !!T y) cil managed { // Method begins at RVA 0x2087 // Code size 30 (0x1e) .maxstack 8 IL_0000: ldarg.0 IL_0001: box !!0 IL_0006: brfalse.s IL_001c IL_0008: ldarga.s 0 IL_000a: ldarg.1 IL_000b: box !!0 IL_0010: constrained. !!0 IL_0016: callvirt instance bool object::Equals(object) IL_001b: ret IL_001c: ldc.i4.0 IL_001d: ret } // end of method Program::Compare </code></pre> <p>and Mono's gmcs.exe compiler (<code>dmcs -optimize+ test.cs</code>):</p> <pre><code>.method private static hidebysig default bool Compare&lt;T&gt; (!!T x, !!T y) cil managed { // Method begins at RVA 0x212c // Code size 33 (0x21) .maxstack 4 IL_0000: ldarg.0 IL_0001: box !!0 IL_0006: brfalse IL_001f IL_000b: ldarga.s 0 IL_000d: ldarg.1 IL_000e: box !!0 IL_0013: constrained. !!0 IL_0019: callvirt instance bool object::Equals(object) IL_001e: ret IL_001f: ldc.i4.0 IL_0020: ret } // end of method Program::Compare </code></pre>
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    1. POUnexpected behavior in c# generic method on .Equals
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    1. CO+1 to offset random -1.
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    2. COFYI (though not really relevant to the question), the CSC IL is padded and structured for use with the debugger; if you emit a release build, it will probably look more like the GMCS output.
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      1. USDan Bryant
    3. CO@DanBryant: spot on; the mono compiler made no difference with `-optimize+`, replacing the MS emitted IL code for `/optimize+` - it is identical to the mono emitted IL now
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