// Map of instruction names to enumeration.
	Instructions map[string]obj.As
	// Map of register names to enumeration.
	Register map[string]int16
	// Table of register prefix names. These are things like R for R(0) and SPR for SPR(268).
	RegisterPrefix map[string]bool
	// RegisterNumber converts R(10) into arm.REG_R10.
	RegisterNumber func(string, int16) (int16, bool)
	// Instruction is a jump.
	IsJump func(word string) bool
}

	{"R27", "R27"},
	{"R28", "R28"},
	{"R29", "R29"},
	{"R3", "R3"},
	{"R31", "R31"},
	{"R4", "R4"},
	{"R5", "R5"},
	{"R6", "R6"},
	{"R7", "R7"},
	{"R8", "R8"},
	{"R9", "R9"},
	{"SPR(269)", "SPR(269)"},
	{"a(FP)", "a(FP)"},
	{"g", "g"},
	{"ret+8(FP)", "ret+8(FP)"},
	{"runtime·abort(SB)", "runtime.abort(SB)"},
	{"·AddUint32(SB)", "pkg.AddUint32(SB)"},
	{"·trunc(SB)", "pkg.trunc(SB)"},

	// ARM64 only.
	if p.arch.Family != sys.ARM64 {
		return false
	}
	// R1.xxx
	return p.peek() == '.'
}

// registerReference parses a register given either the name, R10, or a parenthesized form, SPR(10).
func (p *Parser) registerReference(name string) (int16, bool) {
	r, present := p.arch.Register[name]
	if present {
		return r, true
	}
	if !p.arch.RegisterPrefix[name] {