//    mem1 := call resched (mem0)
		//    goto header
		resched := f.fe.Syslook("goschedguarded")
		call := sched.NewValue1A(bb.Pos, OpStaticCall, types.TypeResultMem, StaticAuxCall(resched, bb.Func.ABIDefault.ABIAnalyzeTypes(nil, nil)), mem0)
		mem1 := sched.NewValue1I(bb.Pos, OpSelectN, types.TypeMem, 0, call)
		sched.AddEdgeTo(h)
		headerMemPhi.AddArg(mem1)

		bb.Succs[p.i] = Edge{test, 0}

	for i := 0; i < nargs; i++ {
		argTypes[i] = typ
	}
	call := b.NewValue0A(pos, OpStaticCall, types.TypeResultMem, StaticAuxCall(fn, b.Func.ABIDefault.ABIAnalyzeTypes(argTypes, nil)))
	call.AddArgs(args...)
	call.AuxInt = int64(nargs) * typ.Size()
	return b.NewValue1I(pos, OpSelectN, types.TypeMem, 0, call)
}

// round to a multiple of r, r is a power of 2.