codeDir string

	// pathMajor is the suffix of modPath that indicates its major version,
	// or the empty string if modPath is at major version 0 or 1.
	//
	// pathMajor is typically of the form "/vN", but possibly ".vN", or
	// ".vN-unstable" for modules resolved using gopkg.in.
	pathMajor string
	// pathPrefix is the prefix of modPath that excludes pathMajor.
	// It is used only for logging.
	pathPrefix string

	R13: TLS pointer
	R30: g (goroutine)

Register names:

	Rn is used for general purpose registers. (0-31)
	Fn is used for floating point registers. (0-31)
	Vn is used for vector registers. Slot 0 of Vn overlaps with Fn. (0-31)
	VSn is used for vector-scalar registers. V0-V31 overlap with VS32-VS63. (0-63)
	CTR represents the count register.
	LR represents the link register.

lUeEGJLQ8kahtBlGb28gQmFyIDxmb29AZXhhbXBsZS5jb20+iQFUBBMBCAA+FiEE
QtS6pb0ASq/RhzRI/Urkj6otOZIFAlxb6KECGwMFCQPCZwAFCwkIBwIGFQoJCAsC
BBYCAwECHgECF4AACgkQ/Urkj6otOZJHhAf+MrWpiWDGsu9yW0lbln7FQpXvhNim
mO4aykYcLRnttr4fbbTaTiq1S+Vn/5/zmcfkGnjdCM5RCO/nZA1mcXpg8pmd+emX
SS72owHVDq1we2QD+/WQljUDY4Qdf0AxqPQm+ARGWC2RwgNA6CSH3Q72fE2por5H
FXti3kjq79NRt8OG+iUZ7W00/v//wzVkQw4m3iTjy2G1Ih8tPEkxEjKoNTfXUNMP
TIHLAdo5/mwj/4M1aK3DeSQkdJtkK2RUTUghrOTZus1Gu+5jJjCbjJp7W1Gl5qsZ

func isPPC64DoublewordRotateMask(v64 int64) bool {
	// Isolate rightmost 1 (if none 0) and add.
	v := uint64(v64)
	vp := (v & -v) + v
	// Likewise, for the wrapping case.
	vn := ^v
	vpn := (vn & -vn) + vn
	return (v&vp == 0 || vn&vpn == 0) && v != 0
}

// Encode a doubleword rotate mask into mb (mask begin) and
// me (mask end, inclusive). Note, POWER ISA labels bits in
// big endian order.

	VERLLVF	V2, V30, V27            // e7be20002c73
	VSCBIB	V0, V23, V24            // e78700000cf5
	VN	V2, V1, V0              // e70210000068
	VNC	V2, V1, V0              // e70210000069
	VO	V2, V1, V0              // e7021000006a
	VX	V2, V1, V0              // e7021000006d
	VN	V16, V1                 // e71010000468
	VNC	V16, V1                 // e71010000469
	VO	V16, V1                 // e7101000046a

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		rf := int(p.From.Reg)
		if rf == C_NONE {
			rf = int(p.To.Reg)
		}
		rt := int(p.To.Reg)
		o1 |= (uint32(rf&31) << 16) | (REGZERO & 31 << 5) | uint32(rt&31)

	case 26: /* op Vn, Vd; op Vn.<T>, Vd.<T> */
		o1 = c.oprrr(p, p.As)
		cf := c.aclass(&p.From)
		af := (p.From.Reg >> 5) & 15
		at := (p.To.Reg >> 5) & 15
		var sz int16
		switch p.As {
		case AAESD, AAESE, AAESIMC, AAESMC:

00000060  76 f3 c9 01 d5 60 b4 34  d4 6f 68 f5 cd af d6 0b  |v....`.4.oh.....|
00000070  e6 af ab ec 64 75 38 d6  17 d4 27 81 96 e5 71 74  |....du8...'...qt|

1. All basic register names are written as Rn.

2. Go uses ZR as the zero register and RSP as the stack pointer.

3. Bn, Hn, Dn, Sn and Qn instructions are written as Fn in floating-point instructions and as Vn
in SIMD instructions.

# Argument mapping rules

1. The operands appear in left-to-right assignment order.

Go reverses the arguments of most instructions.

Examples: