_XM_SSE_INTRINSICS_ has no effect on systems that do not support SSE and SSE2. The Windows versions providing SSE intrinsics support both SSE and SSE2. When _XM_SSE_INTRINSICS_ is defined, code is compiled to use supporting SSE and SSE2 on platforms that support these instruction sets. Therefore, we recommend that you check for _XM_NO_INTRINSICS_ before you determine the status of _XM_ARM_NEON_INTRINSICS_ or _XM_SSE_INTRINSICS_. This directive overrides all other directives. By default, _XM_NO_INTRINSICS_ is not defined. Instead, DirectXMath uses only standard floating point operations. When _XM_NO_INTRINSICS_ is defined, DirectXMath operations are implemented without using any platform-specific intrinsics. Compiler directives tune the functionality that the DirectXMath library uses.
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