MOVD	R17, (offset+8*3)(R1)  \
	MOVD	R18, (offset+8*4)(R1)  \
	MOVD	R19, (offset+8*5)(R1)  \
	MOVD	R20, (offset+8*6)(R1)  \
	MOVD	R21, (offset+8*7)(R1)  \
	MOVD	R22, (offset+8*8)(R1)  \
	MOVD	R23, (offset+8*9)(R1)  \
	MOVD	R24, (offset+8*10)(R1) \
	MOVD	R25, (offset+8*11)(R1) \
	MOVD	R26, (offset+8*12)(R1) \
	MOVD	R27, (offset+8*13)(R1) \
	MOVD	R28, (offset+8*14)(R1) \
	MOVD	R29, (offset+8*15)(R1) \

Examples:

	LDAR (R22), R9                  <=>    ldar x9, [x22]
	LDP 28(R17), (R15, R23)         <=>    ldp x15, x23, [x17,#28]
	MOVWU (R4)(R12<<2), R8          <=>    ldr w8, [x4, x12, lsl #2]
	MOVD (R7)(R11.UXTW<<3), R25     <=>    ldr x25, [x7,w11,uxtw #3]
	MOVBU (R27)(R23), R14           <=>    ldrb w14, [x27,x23]

Register pairs are written as (Rt1, Rt2).

Examples:

func (c *sigctxt) r20() uint64 { return c.regs().gpr[20] }
func (c *sigctxt) r21() uint64 { return c.regs().gpr[21] }
func (c *sigctxt) r22() uint64 { return c.regs().gpr[22] }
func (c *sigctxt) r23() uint64 { return c.regs().gpr[23] }
func (c *sigctxt) r24() uint64 { return c.regs().gpr[24] }
func (c *sigctxt) r25() uint64 { return c.regs().gpr[25] }
func (c *sigctxt) r26() uint64 { return c.regs().gpr[26] }

func (c *sigctxt) r20() uint64 { return c.regs().sc_reg[20] }
func (c *sigctxt) r21() uint64 { return c.regs().sc_reg[21] }
func (c *sigctxt) r22() uint64 { return c.regs().sc_reg[22] }
func (c *sigctxt) r23() uint64 { return c.regs().sc_reg[23] }
func (c *sigctxt) r24() uint64 { return c.regs().sc_reg[24] }
func (c *sigctxt) r25() uint64 { return c.regs().sc_reg[25] }
func (c *sigctxt) r26() uint64 { return c.regs().sc_reg[26] }

	print("r17  ", hex(r.x[17]), "\n")
	print("r18  ", hex(r.x[18]), "\n")
	print("r19  ", hex(r.x[19]), "\n")
	print("r20  ", hex(r.x[20]), "\n")
	print("r21  ", hex(r.x[21]), "\n")
	print("r22  ", hex(r.x[22]), "\n")
	print("r23  ", hex(r.x[23]), "\n")
	print("r24  ", hex(r.x[24]), "\n")
	print("r25  ", hex(r.x[25]), "\n")
	print("r26  ", hex(r.x[26]), "\n")
	print("r27  ", hex(r.x[27]), "\n")
	print("r28  ", hex(r.x[28]), "\n")

func (c *sigctxt) r20() uint64 { return c.regs().mc_gpregs.gp_x[20] }
func (c *sigctxt) r21() uint64 { return c.regs().mc_gpregs.gp_x[21] }
func (c *sigctxt) r22() uint64 { return c.regs().mc_gpregs.gp_x[22] }
func (c *sigctxt) r23() uint64 { return c.regs().mc_gpregs.gp_x[23] }
func (c *sigctxt) r24() uint64 { return c.regs().mc_gpregs.gp_x[24] }
func (c *sigctxt) r25() uint64 { return c.regs().mc_gpregs.gp_x[25] }

func (c *sigctxt) r20() uint64 { return (uint64)(c.regs().sc_x[20]) }
func (c *sigctxt) r21() uint64 { return (uint64)(c.regs().sc_x[21]) }
func (c *sigctxt) r22() uint64 { return (uint64)(c.regs().sc_x[22]) }
func (c *sigctxt) r23() uint64 { return (uint64)(c.regs().sc_x[23]) }
func (c *sigctxt) r24() uint64 { return (uint64)(c.regs().sc_x[24]) }
func (c *sigctxt) r25() uint64 { return (uint64)(c.regs().sc_x[25]) }

func (c *sigctxt) r20() uint64 { return c.regs().gpr[20] }
func (c *sigctxt) r21() uint64 { return c.regs().gpr[21] }
func (c *sigctxt) r22() uint64 { return c.regs().gpr[22] }
func (c *sigctxt) r23() uint64 { return c.regs().gpr[23] }
func (c *sigctxt) r24() uint64 { return c.regs().gpr[24] }
func (c *sigctxt) r25() uint64 { return c.regs().gpr[25] }
func (c *sigctxt) r26() uint64 { return c.regs().gpr[26] }

//    Upper bytes are junk.
//  - *const instructions may use a constant larger than the instruction can encode.
//    In this case the assembler expands to multiple instructions and uses tmp
//    register (R23).

// Suffixes encode the bit width of various instructions.
// V (vlong)     = 64 bit
// WU (word)     = 32 bit unsigned
// W (word)      = 32 bit
// H (half word) = 16 bit
// HU            = 16 bit unsigned

	SLD	$2,R19,R19	// p[5]*4:1
	MOVWZ	(R10)(R18),R22	// tab[1][p[6]]
	ADD	$1024,R10,R10	// tab[2]
	XOR	R21,R22,R21	// xor done R22
	CLRLSLDI $56,R9,$2,R20
	MOVWZ	(R10)(R19),R23	// tab[2][p[5]]
	ADD	$1024,R10,R10	// &tab[3]
	XOR	R21,R23,R21	// xor done R23
	MOVWZ	(R10)(R20),R24	// tab[3][p[4]]
	ADD 	$1024,R10,R10   // &tab[4]
	XOR	R21,R24,R21	// xor done R24
	MOVWZ	(R10)(R8),R25	// tab[4][crc>>24]
	RLDICL	$48,R7,$56,R24	// crc>>16&0xFF