Index BaseDisplacement Scale 1, 2, 4, 8 Segmentation unit Paging unit Virtual address Linear address Physical address Effective addressSelector 1520 Segment register Figure Address generation in the IA-32 architecture  +

SA  SS  B  +  SC  SD  SS1  S  SE  SS  F  SG  SS  H  +  SS1  S  SS1  S  +  SS1  S  WS  LOAD ADDM LOAD LOAD DIV DEL LOAD MPYM LOAD ADDM DIV DEL ADD DIV DEL STOR A B C D E F G H W combined StepOperation performedMachine instruction (a) Operations to be performed and the necessary machine instructions ab+ cd  ef  gh+Stack pointer (b) Temporary results stored in the stack after step 9 Figure 11.9.Stack usage in processing the expressionwab+  cdef  gh+  +  =    