func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
	p.From.Class = 0
	p.To.Class = 0

	c := ctxtz{ctxt: ctxt, newprog: newprog}

	// Rewrite BR/BL to symbol as TYPE_BRANCH.
	switch p.As {
	case ABR, ABL, obj.ARET, obj.ADUFFZERO, obj.ADUFFCOPY:
		if p.To.Sym != nil {
			p.To.Type = obj.TYPE_BRANCH
		}
	}

	// Rewrite float constants to values stored in memory unless they are +0.
	switch p.As {
	case AFMOVS:

	// Their order matters, since it matches the opcode encoding.
	// Gaps in the encoding are indicated by comments.

	AUnreachable // opcode 0x00
	ANop
	ABlock
	ALoop
	AIf
	AElse

	AEnd // opcode 0x0B
	ABr
	ABrIf
	ABrTable
	// ACall and AReturn are WebAssembly instructions. obj.ACALL and obj.ARET are higher level instructions
	// with Go semantics, e.g. they manipulate the Go stack on the linear memory.
	AReturn
	ACall

func progedit(ctxt *obj.Link, p *obj.Prog, newprog obj.ProgAlloc) {
	p.From.Class = 0
	p.To.Class = 0

	c := ctxt9{ctxt: ctxt, newprog: newprog}

	// Rewrite BR/BL to symbol as TYPE_BRANCH.
	switch p.As {
	case ABR,
		ABL,
		obj.ARET,
		obj.ADUFFZERO,
		obj.ADUFFCOPY:
		if p.To.Sym != nil {
			p.To.Type = obj.TYPE_BRANCH
		}
	}

	// Rewrite float constants to values stored in memory.
	switch p.As {

		p.From.Type = obj.TYPE_REG
		p.From.Reg = divisor
		p.Reg = 0
		p.To.Type = obj.TYPE_REG
		p.To.Reg = dividend

		// signed division, rest of the check for -1 case
		if j != nil {
			j2 := s.Prog(s390x.ABR)
			j2.To.Type = obj.TYPE_BRANCH

			var n *obj.Prog
			if v.Op == ssa.OpS390XDIVD || v.Op == ssa.OpS390XDIVW {
				// n * -1 = -n
				n = s.Prog(s390x.ANEG)
				n.To.Type = obj.TYPE_REG

	}
}

func rconv(r int) string {
	return registerNames[r-MINREG]
}

var unaryDst = map[obj.As]bool{
	ASet:          true,
	ATee:          true,
	ACall:         true,
	ACallIndirect: true,
	ABr:           true,
	ABrIf:         true,
	ABrTable:      true,
	AI32Store:     true,
	AI64Store:     true,
	AF32Store:     true,
	AF64Store:     true,
	AI32Store8:    true,
	AI32Store16:   true,

	// a separate slice, add them too.
	for i, s := range ppc64.GenAnames {
		instructions[s] = obj.As(i) + ppc64.AFIRSTGEN
	}
	// Annoying aliases.
	instructions["BR"] = ppc64.ABR
	instructions["BL"] = ppc64.ABL

	return &Arch{
		LinkArch:       linkArch,
		Instructions:   instructions,
		Register:       register,
		RegisterPrefix: registerPrefix,

	AVMSLEG
	AVMSLOG
	AVMSLEOG

	ANOPH // NOP

	// binary
	ABYTE
	AWORD
	ADWORD

	// Breakpoint
	ABRRK

	// end marker
	ALAST

	// aliases
	ABR = obj.AJMP
	ABL = obj.ACALL

	{as: ABEQ, a1: C_CREG, a6: C_BRA, type_: 16, size: 4},
	{as: ABR, a6: C_BRA, type_: 11, size: 4},                                         // b label
	{as: ABR, a6: C_BRAPIC, type_: 11, size: 8},                                      // b label; nop
	{as: ABR, a6: C_LR, type_: 18, size: 4},                                          // blr
	{as: ABR, a6: C_CTR, type_: 18, size: 4},                                         // bctr

	AXVCVSXDSP
	AXVCVSXWSP
	AXVCVUXDSP
	AXVCVUXWSP
	AXSMAXJDP
	AXSMINJDP
	ALASTAOUT // The last instruction in this list. Also the first opcode generated by ppc64map.

	// aliases
	ABR   = obj.AJMP
	ABL   = obj.ACALL
	ALAST = ALASTGEN // The final enumerated instruction value + 1. This is used to size the oprange table.

	// branch
	{i: 16, as: ABEQ, a6: C_SBRA},
	{i: 16, as: ABRC, a1: C_SCON, a6: C_SBRA},
	{i: 11, as: ABR, a6: C_LBRA},
	{i: 16, as: ABC, a1: C_SCON, a2: C_REG, a6: C_LBRA},
	{i: 18, as: ABR, a6: C_REG},
	{i: 18, as: ABR, a1: C_REG, a6: C_REG},
	{i: 15, as: ABR, a6: C_ZOREG},
	{i: 15, as: ABC, a6: C_ZOREG},

	// compare and branch
	{i: 89, as: ACGRJ, a1: C_SCON, a2: C_REG, a3: C_REG, a6: C_SBRA},