Here are a few title options, aiming for a question format: * **Can Visual Studio Handle __int128? The Truth About 128-Bit Integers in Visual Studio** * **Why Does __int128 Fail to Compile in Visual

Compiling __int128 in Visual Studio

In Visual Studio, attempts to utilize the __int128 data type in C projects encounter compilation errors. This error arises because __int128 is not officially supported on the Visual Studio compiler architecture.

To address this, one might consider enabling __int128 support. However, upon checking MSDN documentation and consulting recent discussions, it is clear that there is no such option. Consequently, the __int128 data type remains unavailable.

It is crucial to understand that the syntax highlighting in Visual Studio cannot be relied upon as it is subject to user alterations and often displays non-standard types or even future implementations. Specifically, __int128 is likely a reserved word due to the compilation error it triggers. Therefore, it is advisable to avoid using __int128 as a custom type name.

While __int128 might have been anticipated on x64 or IPF systems through register spanning, as seen with __in64 on 32-bit targets, the current limitation stands. The only available 128-bit types in Visual Studio originate from SIMD data types such as __m128 and its various typed forms.

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