meaning of instruction scheduling

1. instruction scheduling 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 whic 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" ftp://gatekeeper. dec. com/archive/pub/DEC/WRL/research-reports 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] instruction set 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.

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