if rl < REG_F0 || REG_F31 < rl || rh < REG_F0 || REG_F31 < rh {
			c.ctxt.Diag("invalid register pair %v\n", p)
		}
	case ALDP, ALDPW, ALDPSW:
		if rl < REG_R0 || REG_R31 < rl || rh < REG_R0 || REG_R31 < rh {
			c.ctxt.Diag("invalid register pair %v\n", p)
		}
	case ASTP, ASTPW:
		if rl < REG_R0 || REG_R31 < rl || rh < REG_R0 || REG_R31 < rh {
			c.ctxt.Diag("invalid register pair %v\n", p)
		}

	return htmlReplacer.Replace(s)
}

// Redirect to a fixed URL
type redirectHandler struct {
	url  string
	code int
}

func (rh *redirectHandler) ServeHTTP(w ResponseWriter, r *Request) {
	Redirect(w, r, rh.url, rh.code)
}

// RedirectHandler returns a request handler that redirects
// each request it receives to the given url using the given
// status code.
//

	EM_S390          Machine = 22  /* IBM System/390. */
	EM_V800          Machine = 36  /* NEC V800. */
	EM_FR20          Machine = 37  /* Fujitsu FR20. */
	EM_RH32          Machine = 38  /* TRW RH-32. */
	EM_RCE           Machine = 39  /* Motorola RCE. */
	EM_ARM           Machine = 40  /* ARM. */
	EM_SH            Machine = 42  /* Hitachi SH. */
	EM_SPARCV9       Machine = 43  /* SPARC v9 64-bit. */