BCSE

MIPS (originally an acronym for Microprocessor without Interlocked Pipeline Stages) is a reduced instruction set computer (RISC) instruction set (ISA) developed by MIPS Technologies (formerly MIPS Computer Systems, Inc.). The early MIPS architectures were 32-bit, with 64-bit versions added later. Multiple revisions of the MIPS instruction set exist, including MIPS I, MIPS II, MIPS III, MIPS IV, MIPS V, MIPS32, and MIPS64. The current revisions are MIPS32 (for 32-bit implementations) and MIPS64 (for 64-bit implementations). MIPS32 and MIPS64 define a control register set as well as the instruction set.

 Language and sentence  Let  be a set of characters. A language over  is a set of strings of characters drawn from .  Alphabet = English characters Language = English sentences  Alphabet = ASCII Language = C programs  Each string over  is a sentence 

Names (continued) 27/03/15 IUBAT CSC 461 4  Length  If too short, they cannot be connotative(suggest something in addition to its main meaning)  Language examples:  FORTRAN I: maximum 6  COBOL: maximum 30  FORTRAN 90 and ANSI C: maximum 31  Ada and Java: no limit, and all are significant  C++: no limit, but implementers often impose one  Connectors  Pascal, Modula-2, and FORTRAN 77 don't allow  Others do 27/03/15 IUBAT CSC 461 7  A variable is an abstraction of a memory cell  Abstract memory cell -the physical cell or collection of cells associated with a variable  Variables can be characterized as a set of attributes:  Name  Address  Value  Type  Lifetime  Scope