at bit 0, CR1 at bit 4, etc. The value is computed as 4*CR+condition
	      with these condition values:

	      0 -> LT
	      1 -> GT
	      2 -> EQ
	      3 -> OVG

		Thus 0 means test CR0 for LT, 5 means CR1 for GT, 30 means CR7 for EQ.

	  op3: branch target

Examples:

	BC 12, 0, target		<=>	blt cr0, target
	BC 12, 2, target		<=>	beq cr0, target

			cr0 := cr[0]
			stride, pix := 0, []byte(nil)
			if rgba != nil {
				stride, pix = rgba.Stride, rgba.Pix
			} else if nrgba != nil {
				stride, pix = nrgba.Stride, nrgba.Pix
			}
			if stride != 0 {
				j0 := (y - b.Min.Y) * stride
				j1 := j0 + b.Dx()*4
				for j := j0; j < j1; j += 4 {
					cr0[i+0] = pix[j+0]
					cr0[i+1] = pix[j+1]
					cr0[i+2] = pix[j+2]

		// like a branch or isel that is testing a bit in a condition
		// register field.
		if arg == CR0 && strings.HasPrefix(inst.Op.String(), "cmp") {
			return "" // don't show cr0 for cmp instructions
		} else if arg >= CR0 {
			return fmt.Sprintf("cr%d", int(arg-CR0))
		}
		bit := condBit[(arg-Cond0LT)%4]
		if arg <= Cond0SO {
			return bit
		}

	X15:  "X15",
	CS:   "CS",
	SS:   "SS",
	DS:   "DS",
	ES:   "ES",
	FS:   "FS",
	GS:   "GS",
	GDTR: "GDTR",
	IDTR: "IDTR",
	LDTR: "LDTR",
	MSW:  "MSW",
	TASK: "TASK",
	CR0:  "CR0",
	CR1:  "CR1",
	CR2:  "CR2",
	CR3:  "CR3",
	CR4:  "CR4",
	CR5:  "CR5",
	CR6:  "CR6",
	CR7:  "CR7",
	CR8:  "CR8",
	CR9:  "CR9",
	CR10: "CR10",
	CR11: "CR11",
	CR12: "CR12",

	// Forbid memory operands for MOV CR/DR. See #24981.
	MOVQ CR0, (AX)                  // ERROR "invalid instruction"
	MOVQ CR2, (AX)                  // ERROR "invalid instruction"
	MOVQ CR3, (AX)                  // ERROR "invalid instruction"
	MOVQ CR4, (AX)                  // ERROR "invalid instruction"
	MOVQ CR8, (AX)                  // ERROR "invalid instruction"
	MOVQ (AX), CR0                  // ERROR "invalid instruction"

	VCMPEQUBCC	V2,V1,V6
	BNE	CR6,foundat3	// Match found at R8+48 bytes, jump out

	ADD	$64,R8
	CMPU	R8,R9,CR1
	BNE	CR1,loop64	// R8 != &s[len &^ 63]?

	PCALIGN	$32
	BEQ	notfound	// Is tail length 0? CR0 is set before entering loop64.

	CMP	R4,$32		// Tail length >= 32, use cmp32 path.
	CMP	R4,$16,CR1
	BGE	cmp32

	ADD	R8,R4,R9
	ADD	$-16,R9
	BLE	CR1,cmp64_tail_gt0

	X15:  "X15",
	CS:   "CS",
	SS:   "SS",
	DS:   "DS",
	ES:   "ES",
	FS:   "FS",
	GS:   "GS",
	GDTR: "GDTR",
	IDTR: "IDTR",
	LDTR: "LDTR",
	MSW:  "MSW",
	TASK: "TASK",
	CR0:  "CR0",
	CR1:  "CR1",
	CR2:  "CR2",
	CR3:  "CR3",
	CR4:  "CR4",
	CR5:  "CR5",
	CR6:  "CR6",
	CR7:  "CR7",
	CR8:  "CR8",
	CR9:  "CR9",
	CR10: "CR10",
	CR11: "CR11",
	CR12: "CR12",

	FCPSGN F1, F2                   // fc420810
	FCPSGNCC F1, F2                 // fc420811
	FCMPO F1, F2                    // fc011040
	FCMPO F1, F2, CR0               // FCMPO F1,CR0,F2 // fc011040
	FCMPU F1, F2                    // fc011000
	FCMPU F1, F2, CR0               // FCMPU F1,CR0,F2 // fc011000
	LVX (R3)(R4), V1                // 7c2418ce
	LVX (R3)(R0), V1                // 7c2018ce
	LVX (R3), V1                    // 7c2018ce

		STFD, STFDU,
		STFS, STFSU,
		STQ, HASHST, HASHSTP:
		return op + " " + strings.Join(args, ",")

	case FCMPU, FCMPO, CMPD, CMPDI, CMPLD, CMPLDI, CMPW, CMPWI, CMPLW, CMPLWI:
		crf := int(inst.Args[0].(CondReg) - CR0)
		cmpstr := op + " " + args[1] + "," + args[2]
		if crf != 0 { // print CRx as the final operand if not implied (i.e BF != 0)
			cmpstr += "," + args[0]
		}
		return cmpstr

	case LIS:

		return nil
	case TypeUnknown:
		return nil
	case TypeReg:
		return R0 + Reg(a.BitFields.Parse(i))
	case TypeCondRegBit:
		return Cond0LT + CondReg(a.BitFields.Parse(i))
	case TypeCondRegField:
		return CR0 + CondReg(a.BitFields.Parse(i))
	case TypeFPReg:
		return F0 + Reg(a.BitFields.Parse(i))
	case TypeVecReg:
		return V0 + Reg(a.BitFields.Parse(i))
	case TypeVecSReg:
		return VS0 + Reg(a.BitFields.Parse(i))