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USJohannes Petzold
 

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  1. USJohannes Petzold
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    1. PO.NET Math.Log10() behaves differently on different machines
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    1. POWhy does .NET read values of unaffected properties on reception of INotifyPropertyChanged.PropertyChanged event?
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    2. PO.NET Math.Log10() behaves differently on different machines
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    1. COYour last comments led me to find out that _controlfp() behaves differently, depending on which msvcr*.dll is used. Unlike before, I can now reproduce the issue on any 32-bit CPU simply by using "msvcr100_clr0400.dll" instead of "msvcrt.dll". I currently can't run tests on machine B anymore, but I think it's fair to assume that the FPU control word is the root cause for explaining the inconsistent behavior; that fact was just somewhat covered up by the inconsistent implementation of _controlfp(). Thanks for your help!
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    2. COI got the following results from executing your code on several machines: If **compiling for x86** platform target and **running on 64bit** CPU, I get the same results as you. Every other combination (compile with "Any CPU" target and/or run on 32bit CPU) never prints -Infinity. I still haven't executed the code on the original machine B (32bit CPU), will post results here once I got the chance (don't have direct access to that machine, so it may still be a few days). Note - I had to change the code to use _controlfp() instead of _controlfp_s(), the latter is not included in my msvcrt.dll.
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    3. COJon: machine B output is from a debug print statement in a large application. The debug statement uses string.Format, and one of its argument is nothing but Math.Log10(double.Epsilon)
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      1. USJohannes Petzold
 

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