Why is it not working to include arm_neon.h in a ARM64EC project?

JbR 1 Reputation point

Inside a ARM64EC project, including <arm_neon.h> with Visual Studio 2022 will result in a compilation error:
In arm_neon.h:21 Error: This header is specific to ARM targets

Why is it allowed to use this header in ARM and ARM64 but not in ARM64EC?

A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
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