instruction scheduling definition
The compiler phase that orders instructions on a
pipelined, superscalar, or VLIW architecture so as to
maximise the number of function units operating in parallel
and to minimise the time they spend waiting for each other.
Examples are filling a delay slot; interspersing
floating-point instructions with integer instructions to
keep both units operating; making adjacent instructions
independent, e.g. one which writes a register and another which
reads from it; separating memory writes to avoid filling the
write buffer.
Norman P. Jouppi and David W. Wall, "Available
Instruction-Level Parallelism for Superscalar and
Superpipelined Processors",
Proceedings of the Third International Conference on
Architectural Support for Programming Languages and Operating
Systems, pp. 272--282, 1989.
[The SPARC Architecture Manual, v8, ISBN 0-13-825001-4]
Nearby terms:
Instruction Address Register « instruction mnemonic « instruction prefetch « instruction scheduling » instruction set » instruction set architecture » Instruction Set Processor
instruction set definition
<architecture> The collection of machine language
instructions that a particular processor understands.
The term is almost synonymous with "instruction set
architecture" since the instructions are fairly meaningless
in isolation from the registers etc. that they manipulate.
(1999-07-05)
Nearby terms:
instruction mnemonic « instruction prefetch « instruction scheduling « instruction set » instruction set architecture » Instruction Set Processor » instrument
instruction set architecture definition
<architecture> (ISA) The parts of a processor's design that
need to be understood in order to write assembly language,
such as the machine language instructions and registers.
Parts of the architecture that are left to the implementation,
such as number of superscalar functional units, cache
size and cycle speed, are not part of the ISA.
The definition of SPARC, for example, carefully
distinguishes between an implementation and a specification.
(1999-01-16)
Nearby terms:
instruction prefetch « instruction scheduling « instruction set « instruction set architecture » Instruction Set Processor » instrument » int
Instruction Set Processor definition
<language> (ISP) A family of languages for describing the
instruction sets of computers.
["Computer Structures: Readings and Examples", D.P. Siewiorek
et al, McGraw-Hill 1982].
(1995-10-12)
Nearby terms:
instruction scheduling « instruction set « instruction set architecture « Instruction Set Processor » instrument » int » INTCODE
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