RISC : Java Glossary

by Roedy Green ©1996-2008 Canadian Mind Products
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RISC: Reduced Instruction Set Computer. A computer than uses a simplified instruction set that can be implemented without microcode. In contrast CISC means Complex Instuction Set Computer which uses an instruction set that closely mirrors some high level language. The Pentium computers are the main remaining CISC architecture. Is it quite antiquated as an architecture, designed originally for assembler coding rather than high level compilation. It was designed back when registers were very expensive. It has far too few registers for a modern CPU chip. The other emerging CISC instruction set is the Java JVM. The main advantage of CISC is very compact machine code. Java class files are often several orders of magnitude smaller than other representations. See this biased but informative essay on the advantages of RISC.
CISC
CPU

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