description: 'IptablesPostWriteCheckInterval is the period after Felix
                  has done a write to the dataplane that it schedules an extra read
                  back in order to check the write was not clobbered by another process.
                  This should only occur if another application on the system doesn''t
                  respect the iptables lock. [Default: 1s]'
                pattern: ^([0-9]+(\\.[0-9]+)?(ms|s|m|h))*$

	// cond: canMergeLoad(v, l) && clobber(l)
	// result: (CMPBload {sym} [off] ptr x mem)
	for {
		l := v_0
		if l.Op != Op386MOVBload {
			break
		}
		off := auxIntToInt32(l.AuxInt)
		sym := auxToSym(l.Aux)
		mem := l.Args[1]
		ptr := l.Args[0]
		x := v_1
		if !(canMergeLoad(v, l) && clobber(l)) {
			break
		}
		v.reset(Op386CMPBload)

	// match: (MOVBZreg <t> x:(MOVBload [o] {s} p mem))
	// cond: x.Uses == 1 && clobber(x)
	// result: @x.Block (MOVBZload <t> [o] {s} p mem)
	for {
		t := v.Type
		x := v_0
		if x.Op != OpS390XMOVBload {
			break
		}
		o := auxIntToInt32(x.AuxInt)
		s := auxToSym(x.Aux)
		mem := x.Args[1]
		p := x.Args[0]
		if !(x.Uses == 1 && clobber(x)) {
			break
		}
		b = x.Block

	// cond: buildcfg.GOPPC64 >= 9 && l.Uses == 1 && clobber(l)
	// result: (MADDLD x y z)
	for {
		for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
			l := v_0
			if l.Op != OpPPC64MULLD {
				continue
			}
			y := l.Args[1]
			x := l.Args[0]
			z := v_1
			if !(buildcfg.GOPPC64 >= 9 && l.Uses == 1 && clobber(l)) {
				continue
			}
			v.reset(OpPPC64MADDLD)

			return
		}
		left := left.(*ir.Name)
		// Update variable assignment.
		s.vars[left] = right
		s.addNamedValue(left, right)
		return
	}

	// If this assignment clobbers an entire local variable, then emit
	// OpVarDef so liveness analysis knows the variable is redefined.