// returns nil.
//
// Currently, it outlines map assignment statements with large,
// side-effect-free RHS expressions.
func tryWrapGlobalInit(n ir.Node) *ir.Func {
	// Look for "X = ..." where X has map type.
	// FIXME: might also be worth trying to look for cases where
	// the LHS is of interface type but RHS is map type.
	if n.Op() != ir.OAS {
		return nil
	}
	as := n.(*ir.AssignStmt)

	v, haveCounters := mm.pod.pmm[key]
	if haveCounters {
		counters = v.Counters
	}

	if pcombine {
		// If the merge is running in "combine programs" mode, then hash
		// the function and look it up in the package ftab to see if we've
		// encountered it before. If we haven't, then register it with the
		// meta-data builder.
		fnhash := encodemeta.HashFuncDesc(fd)
		gfidx, ok := mm.p.ftab[fnhash]
		if !ok {

				// untyped argument will never match a composite parameter type; the
				// only parameter type it can possibly match against is a *TypeParam.
				// Thus, for untyped arguments we only need to look at parameter types
				// that are single type parameters.
				// Also, untyped nils don't have a default type and can be ignored.
				// Finally, it's not possible to have an alias type denoting a type

	// as its definition, in which case it will call tcAssign.
	// in that case, do not call typecheck back, or it will cycle.
	// if the variable has a type (ntype) then typechecking
	// will not look at defn, so it is okay (and desirable,
	// so that the conversion below happens).

	checkLHS := func(i int, typ *types.Type) {
		if n := lhs[i]; typ != nil && ir.DeclaredBy(n, stmt) && n.Type() == nil {

// the CanInline call. This function returns the amount to relax the
// budget initially (to allow for a large score adjustment); later on
// in RevisitInlinability we'll look at each individual function to
// demote it if needed.
func BudgetExpansion(maxBudget int32) int32 {
	if base.Debug.InlBudgetSlack != 0 {
		return int32(base.Debug.InlBudgetSlack)
	}

		// If the source of a MoveWB is volatile (will be clobbered by a
		// function call), we need to copy it to a temporary location, as
		// marshaling the args of wbMove might clobber the value we're
		// trying to move.
		// Look for volatile source, copy it to temporary before we check
		// the write barrier flag.
		// It is unlikely to have more than one of them. Just do a linear
		// search instead of using a map.
		// See issue 15854.

	// search current depth
	for len(current) > 0 {
		var next []embeddedType // embedded types found at current depth

		// look for (pkg, name) in all types at current depth
		for _, e := range current {
			typ := e.typ

			// If we have a named type, we may have associated methods.
			// Look for those first.
			if named := asNamed(typ); named != nil {
				if alt := seen.lookup(named); alt != nil {

		hookWrite = func(cv string, which int, val string) string {
			return fmt.Sprintf("%sStoreUint32(&%s[%d], %s)",
				atomicPackagePrefix(), cv, which, val)
		}
	}

	// Generate the registration hook sequence for the function. This
	// sequence looks like
	//
	//   counterVar[0] = <num_units>
	//   counterVar[1] = pkgId
	//   counterVar[2] = fnId
	//
	cv := f.fn.counterVar

func isValid(t Type) bool { return Unalias(t) != Typ[Invalid] }

// The isX predicates below report whether t is an X.
// If t is a type parameter the result is false; i.e.,
// these predicates don't look inside a type parameter.

func isBoolean(t Type) bool        { return isBasic(t, IsBoolean) }
func isInteger(t Type) bool        { return isBasic(t, IsInteger) }
func isUnsigned(t Type) bool       { return isBasic(t, IsUnsigned) }

		for _, v := range b.Values {
			if n, ok := v.Aux.(*ir.Name); ok {
				switch n.Class {
				case ir.PPARAMOUT:
					if n.IsOutputParamInRegisters() && v.Op == ssa.OpVarDef {
						// ignore VarDef, look for "real" uses.
						// TODO: maybe do this for PAUTO as well?
						continue
					}
					fallthrough
				case ir.PPARAM, ir.PAUTO:
					n.SetUsed(true)
				}
			}
		}
	}