+- `__ARM_ARCH` Defined as an integer literal that represents the ARM architecture version. The value is defined as 8 for the Armv8-A architecture. For 8.1 and onwards, the value is scaled for minor versions, such as X.Y, by using the formula X * 100 + Y as defined by the ARM C language extension. For example, for Armv8.1, `__ARM_ARCH` is 8 * 100 + 1 or 801. To set the ARM architecture version, see [`/arch (ARM64)`](../build/reference/arch-arm64.md). This macro was introduced in Visual Studio 2022 version 17.10.
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