e3a478523e
Add tests to cover the full range of behaviors observed around optional register operands for the `tlbip' and `sysp' instructions, namely: * Not all `tlbip' operations take GPR operands. When this is the case, we should check that neither optional operand was supplied. * When a `tlbip' operation is labeled with the `F_HASXT' flag, xzr is not a valid optional operand. In such case, at least the fist optional register needs to be specified with a non-xzr value. * The first operand for both insns should be either xzr or an even-numbered register (n % 2 == 0). In the former scenario, the second operand should default to xzr too, while in the latter, it should default to n + 1.
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