Language Processors
In analyzing the compilation of PL/I program, the term "Machine independent optimization" is associated with

recognition of basic elements and creation of uniform symbols
recognition of basic syntactic constructs through reductions
use of macro processor to produce more optimal assembly code
creation of more optional matrix

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Language Processors
The advantage(s) of incorporating the macro processor into pass 1 is/ are:

many functions do not have to be implemented twice
more flexibility is available to the programmer in which he/she may use all the features of the assembler in conjunction with macros
Functions are combined and it is not necessary to create intermediate files as output from the macro processor and input to the assembler
All of these

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Language Processors
The system/370 assembler language

allows multiple programs to reside in separate areas of core at the same time
is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain
allows the programmer to write base registers and displacements explicitly in the source program
is a term that refers to the control programs of an operating system

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