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  • 32bit and 64bit confusion around x86 and x64 and the .NET Framework and CLR

    Basic
    1. VS has only x32bit version, NO x64 version.
    2. DotNet Framework including basic library (System.*), CLR, JIT compiler, etc, have x32 and x64 version. For example, I have a C:\Windows\Microsoft.NET\Framework and a C:\Windows\Microsoft.NET\Framework64 folder.
    3. a dotnet assembly only contains IL before first time running, so at that time, it's not process-specific (x32 / x64). By default, the Platform Target is "Any CPU." Remember that our C# or VB compiles to IL, and that IL is basically processor agnostic. It's the JIT that makes the decision at the last minute.
    4. When a dotnet assembly is loaded into x32/x64 CLR, the CLR helps you find corresponding dependent modules.
    5. That 64-bit process is also having its code JIT compiled to use not the x86 instruction set we're used to, but the AMD64 instruction set. This is important to note: It doesn't matter if you have an AMD or an Intel processor, if you're 64-bit you are using the AMD64 instruction set. The short story is - Intel lost. For us, it doesn't really matter.
    6. VS installed on either 32-bit or 64-bit OS can create 32-bit or 64-bit applications, but of course the applications need the corresponding platform to execute.
    7. To debug a x64 app on x64 OS, you need VS remote debugger as a must as VS is only x32 app so that it needs a way to debug a x64 app.

    MOre detail, please refer to below two:
    1. My blog

    2. Scott blog

    For further understanding:

    2. Reference to a x32 dotnet assembly for building and then make that app can call corresponding that assembly x32/x64 version at runtime on x32 / x64 OS?

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  • 原文地址:https://www.cnblogs.com/taoxu0903/p/1864675.html
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