type ValAndOff int64

func (x ValAndOff) Val() int32   { return int32(int64(x) >> 32) }
func (x ValAndOff) Val64() int64 { return int64(x) >> 32 }
func (x ValAndOff) Val16() int16 { return int16(int64(x) >> 32) }
func (x ValAndOff) Val8() int8   { return int8(int64(x) >> 32) }

func (x ValAndOff) Off64() int64 { return int64(int32(x)) }
func (x ValAndOff) Off() int32   { return int32(x) }

func (x ValAndOff) String() string {

type sparseSet struct {
	dense  []ssa.ID
	sparse []int32
}

// newSparseSet returns a sparseSet that can represent
// integers between 0 and n-1.
func newSparseSet(n int) *sparseSet {
	return &sparseSet{dense: nil, sparse: make([]int32, n)}
}

func (s *sparseSet) contains(x ssa.ID) bool {
	i := s.sparse[x]
	return i < int32(len(s.dense)) && s.dense[i] == x
}

	})
	ctxt.Data = append(ctxt.Data, ctxt.SEHSyms...)
	ctxt.SEHSyms = nil

	ctxt.pkgIdx = make(map[string]int32)
	ctxt.defs = []*LSym{}
	ctxt.hashed64defs = []*LSym{}
	ctxt.hasheddefs = []*LSym{}
	ctxt.nonpkgdefs = []*LSym{}

	var idx, hashedidx, hashed64idx, nonpkgidx int32
	ctxt.traverseSyms(traverseDefs|traversePcdata, func(s *LSym) {
		if s.ContentAddressable() {

			"(*Bool).Store",
			"(*Bool).Swap",
			"(*Int32).Add",
			"(*Int32).CompareAndSwap",
			"(*Int32).Load",
			"(*Int32).Store",
			"(*Int32).Swap",
			"(*Int64).Add",
			"(*Int64).CompareAndSwap",
			"(*Int64).Load",
			"(*Int64).Store",
			"(*Int64).Swap",
			"(*Uint32).Add",
			"(*Uint32).CompareAndSwap",
			"(*Uint32).Load",
			"(*Uint32).Store",
			"(*Uint32).Swap",
			"(*Uint64).Add",

	fixups   []relFixup
	doffsets []declOffset
	inlIndex int32
	defseen  bool
}

type declOffset struct {
	// Index of variable within DCL list of pre-optimization function
	dclIdx int32
	// Offset of var's child DIE with respect to containing subprogram DIE
	offset int32
}

type relFixup struct {
	refsym *LSym
	relidx int32
	dclidx int32
}

type fnState struct {
	// precursor function

//sys	Madvise(b []byte, advice int) (err error)
//sys	Mkdir(path string, mode uint32) (err error)
//sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
//sys	Mkfifo(path string, mode uint32) (err error)
//sys	Mkfifoat(dirfd int, path string, mode uint32) (err error)
//sys	Mknod(path string, mode uint32, dev int) (err error)
//sys	Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
//sys	Mlock(b []byte) (err error)

	case arg_label24:
		imm := (x & (1<<24 - 1)) << 2
		return PCRel(int32(imm<<6) >> 6)

	case arg_label24H:
		h := (x >> 24) & 1
		imm := (x&(1<<24-1))<<2 | h<<1
		return PCRel(int32(imm<<6) >> 6)

	case arg_label_m_12:
		d := int32(x & (1<<12 - 1))
		return Mem{Base: PC, Mode: AddrOffset, Offset: int16(-d)}

	case arg_label_p_12:
		d := int32(x & (1<<12 - 1))

(NEG  (MOVDconst [x])) => (MOVDconst [-x])
(NEGW (MOVDconst [x])) => (MOVDconst [int64(int32(-x))])

// Shift of a constant.
(SLLI [x] (MOVDconst [y])) && is32Bit(y << uint32(x)) => (MOVDconst [y << uint32(x)])
(SRLI [x] (MOVDconst [y])) => (MOVDconst [int64(uint64(y) >> uint32(x))])
(SRAI [x] (MOVDconst [y])) => (MOVDconst [int64(y) >> uint32(x)])

// SLTI/SLTIU with constants.

	ANYMEM  = E_MEM | E_MEMSP | E_MEMSB
	//DELAY = LOAD|BRANCH|FCMP
	DELAY = BRANCH /* only schedule branch */
)

type Dep struct {
	ireg uint32
	freg uint32
	cc   uint32
}

type Sch struct {
	p       obj.Prog
	set     Dep
	used    Dep
	soffset int32
	size    uint8
	nop     uint8
	comp    bool
}

func (c *ctxt0) sched(p0, pe *obj.Prog) {
	var sch [NSCHED]Sch

	/*

	var segments []*dataSegment
	for secIndex, ds := range dataSects {
		data := ds.data
		offset := int32(ds.sect.Vaddr)

		// skip leading zeroes
		for len(data) > 0 && data[0] == 0 {
			data = data[1:]
			offset++
		}

		for len(data) > 0 {
			dataLen := int32(len(data))
			var segmentEnd, zeroEnd int32
			if len(segments)+(len(dataSects)-secIndex) == maxNumSegments {
				segmentEnd = dataLen