for i, child := range children {
			// [childPos, childEnd) is unaugmented interval of child.
			childPos := child.Pos()
			childEnd := child.End()

			// [augPos, augEnd) is whitespace-augmented interval of child.
			augPos := childPos
			augEnd := childEnd
			if i > 0 {
				augPos = children[i-1].End() // start of preceding whitespace
			}
			if i < l-1 {
				nextChildPos := children[i+1].Pos()

			if ok && elim[v] == nil {
				elim[v] = n
				changed = true
			}
			// Other args might hold pointers to autos.
			args = args[1:]
		}

		// The code below assumes that we have handled all the ops
		// with sym effects already. Sanity check that here.
		// Ignore Args since they can't be autos.
		if v.Op.SymEffect() != SymNone && v.Op != OpArg {
			panic("unhandled op with sym effect")
		}

diffie-hellman-group1-sha1
```

`--sftp=cipher-algos=...` specifies the allowed cipher algorithms. 
If unspecified then a sensible default is used.

Valid values: 
```
aes128-ctr
aes192-ctr
aes256-ctr
******@****.***
******@****.***
******@****.***
arcfour256
arcfour128
arcfour
aes128-cbc
3des-cbc
```

			sshPrivateKey = tokens[1]
		case "pub-key-algos":
			allowPubKeys = filterAlgos(arg, strings.Split(tokens[1], ","), supportedPubKeyAuthAlgos)
		case "kex-algos":
			allowKexAlgos = filterAlgos(arg, strings.Split(tokens[1], ","), supportedKexAlgos)
		case "cipher-algos":
			allowCiphers = filterAlgos(arg, strings.Split(tokens[1], ","), supportedCiphers)
		case "mac-algos":

	// Sort non-autos before autos.
	if needAlloc(a) != needAlloc(b) {
		return needAlloc(b)
	}

	// If both are non-auto (e.g., parameters, results), then sort by
	// frame offset (defined by ABI).
	if !needAlloc(a) {
		return a.FrameOffset() < b.FrameOffset()
	}

	// From here on, a and b are both autos (i.e., local variables).

	// Sort followers after leaders, if mls != nil

// addressed. Which is expected to be one of 11-13, 21-23, 31, 32,
// and y.val() should be equal to which and y.p.val() should
// be equal to z.val().  Also, x(.p)**8 == x; that is, the
// autos are all linked into a ring.
//
//go:noinline
func (v V) autos_ssa(which, w1, x1, w2, x2 int64) (y, z V) {
	fill_ssa(v.w, v.x, &v, v.p) // gratuitous no-op to force addressing
	var a, b, c, d, e, f, g, h V

		if strvalue, ok := s.colValue[n].(string); ok && strings.HasPrefix(strvalue, "?") {
			if strvalue == "?" {
				val = args[argPos].Value
			} else {
				// Assign value from argument placeholder name.
				if v := valueFromPlaceholderName(args, strvalue[1:]); v != nil {
					val = v
				}
			}
			argPos++
		} else {
			val = s.colValue[n]
		}
		if doInsert {
			cols[colidx] = val
		}
	}

			rr.add(declf(rr.Loc, argname, "%s", rhs))
		}
		bexpr := exprf("%s.Op != addLater", argname)
		rr.add(&CondBreak{Cond: bexpr})
		argPos, argCheckOp := genMatch0(rr, arch, expr, argname, cnt, false)
		bexpr.(*ast.BinaryExpr).Y.(*ast.Ident).Name = argCheckOp

		if argPos != "" {
			// Keep the argument in preference to the parent, as the
			// argument is normally earlier in program flow.

	nNotNeed, // Number of Values not needing a stack slot
	nNamedSlot, // Number of Values using a named stack slot
	nReuse, // Number of values reusing a stack slot
	nAuto, // Number of autos allocated for stack slots.
	nSelfInterfere int32 // Number of self-interferences
}

func newStackAllocState(f *Func) *stackAllocState {
	s := f.Cache.stackAllocState
	if s == nil {
		return new(stackAllocState)
	}

	{name: "lowered deadcode for cse", fn: deadcode}, // deadcode immediately before CSE avoids CSE making dead values live again
	{name: "lowered cse", fn: cse},
	{name: "elim unread autos", fn: elimUnreadAutos},
	{name: "tighten tuple selectors", fn: tightenTupleSelectors, required: true},
	{name: "lowered deadcode", fn: deadcode, required: true},
	{name: "checkLower", fn: checkLower, required: true},