Reads the content of an extended control register.
This intrinsic reads from extended control registers. Currently, the only control register allowed/defined is (XCR0) XFEATURE_ENABLED_MASK register. The corresponding constant is defined in the immintrin.h file to refer to this register: #define _XCR_XFEATURE_ENABLED_MASK 0
This intrinsic maps to XGETBV instruction.
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