How do I compare two capabilities for equality?

The CHERI intrinsic int cheri_is_equal_exact(void *x, void *y) from the header file cheriintrin.h compares the pointer and the metadata values, and only returns true if the two capabilities are bit-equivalent in all corresponding 129 bits.

On the other hand, the simple C == operator only compares the 64 bits of the pointer value, without any inspection of metadata. This means == is good for pointer equality checks, but not appropriate for capability equality, so select your equality relation with care!