At times, however, local data mustbe stored in memory. Common cases of this include these:.There are not enough registers to hold all of the local data..The address operator ‘&’ is applied to a local variable, and hence we must beable to generate an address for it..Some of the local variables are arrays or structures and hence must be accessedby array or structure references.

local variables such as x are often kept in registers rather thanstored in memory locations. Register access is much faster than memory access.