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Assembly languages are a family of low-level languages for programming
computers, microprocessors, microcontrollers, and other (usually) integrated
circuits. They implement a symbolic representation of the numeric machine codes
and other constants needed to program a particular CPU architecture. This
representation is usually defined by the hardware manufacturer, and is based on
abbreviations (called mnemonics) that help the programmer remember individual
instructions, registers, etc. An assembly language is thus specific to a certain
physical or virtual computer architecture (as opposed to most high-level
languages, which are usually portable).
Typically a modern assembler creates object code by translating assembly
instruction mnemonics into opcodes, and by resolving symbolic names for memory
locations and other entities. The use of symbolic references is a key feature of
assemblers, saving tedious calculations and manual address updates after program
modifications. Most assemblers also include macro facilities for performing
textual substitution—e.g., to generate common short sequences of instructions as
inline, instead of called subroutines.
Assemblers are generally simpler to write than compilers for high-level
languages, and have been available since the 1950s. Modern assemblers,
especially for RISC based architectures, such as MIPS, Sun SPARC, and HP
PA-RISC, as well as x86(-64), optimize instruction scheduling to exploit the CPU
pipeline efficiently.
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