implementation of Go.  This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation.  If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this

		p.errorf("prefix %c not allowed for register: %c%s", prefix, prefix, name)
	}
	c := p.peek()
	if c == ':' || c == ',' || c == '+' {
		// 2nd register; syntax (R1+R2) etc. No two architectures agree.
		// Check the architectures match the syntax.
		switch p.next().ScanToken {
		case ',':
			if !p.arch.InFamily(sys.ARM, sys.ARM64) {
				p.errorf("(register,register) not supported on this architecture")
				return