RISC


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RISC

[risk]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

RISC

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RISC

(Reduced Instruction Set Computer) A computer architecture that reduces chip complexity by using simpler machine instructions. In order to execute the equivalent comprehensive instructions found in traditional CISC computers (complex instruction set computers), such as Intel's ubiquitous x86 line, compilers for RISC hardware have to generate multiple RISC instructions. The most widely used RISC microprocessors are the ARM CPUs found in every smartphone and almost every tablet.

RISC and CISC Are Both Thriving
Although RISC designs date back to the 1960s, commercial RISC CPUs from MIPS and Sun became popular in the late 1980s. When introduced, RISC CPUs were faster than their CISC counterparts; however, advancements in CISC technology over the years narrowed the performance advantage. Ever-increasing clock speeds and enhanced architectures made CISC CPUs more powerful, and Windows caused the Intel CISC-based x86 market to grow exponentially in the 1990s. Even after a decade of use, Apple switched its Macs from RISC to CISC (see Intel Mac). Nevertheless, due to the low power consumption of RISC CPUs, smartphones and tablets (except for Windows tablets) are almost exclusively RISC-based ARM chips. See x86 and ARM.


No Microcode Conversion
RISC processors have no microcode conversion overhead. RISC keeps instruction size constant and bans indirect addressing, retaining only those instructions that can be overlapped and made to execute in one machine cycle or less. See microcode, indirect address and compiler.
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References in periodicals archive ?
Clearly, the RISC core will be in idle mode until the DMA completes moving the data (Figure 8).
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Mike Schwarz, a partner at Bindmans LLP, told the Home Affairs Select Committee of possible cash payments made by investigation firm Risc to sources of theirs who were "presumably police officers or those close to the investigation".
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In this case, AEG-1 was found to work with another protein, SND1, to provide the scaffold for the formation of RISC. Since both AEG-1 and SND1 are increased in HCC, the net effect is increased RISC activity."
The company drives the broadest architectural alliance that is delivering 32- and 64-bit embedded RISC solutions.
RISC, which is based in Port of Rotterdam, has some 210 employees and reported a turnover of DKK120m in 2003.
ARM is the industry's leading provider of 16/32-bit embedded RISC microprocessor solutions.
ARM is a provider of 16/32-bit embedded RISC microprocessor solutions.
ARM, (NASDAQ:ARMHY), Cambridge, England, the industry's leading provider of 16/32-bit embedded RISC microprocessor solutions, and Datang Telecom Technology and Industry Group, one of the pioneers of China's maturing telecommunications industry, has announced that Datang has licensed the ARM946E microprocessor core.
Thus far, says Yokley, Itanium-based and Opteron-based machines, which are trying to give RISC-class floating point performance for prices that are less than a RISC machine but more than a 32-bit X86 machine, have not really penetrated the workstation market.
used Intel processors; Sun and other RISC vendors grabbed 11 percent, while AMD trailed with just 4 percent.