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Short Retrospective on RISC

Short Retrospective on RISC. Open Microcode. HLL. ISA. Microcode. ISA. Control Signals. Compiler Generates Lowest Level of Interpretation No Microcode Single Cycle Execution Complex Compiler vs. Complex Hardware Issues: Bandwidth, Compiler Complexity, On Chip Tailoring

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Short Retrospective on RISC

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  1. Short Retrospective on RISC

  2. Open Microcode HLL ISA Microcode ISA Control Signals • Compiler Generates Lowest Level of Interpretation • No Microcode • Single Cycle Execution • Complex Compiler vs. Complex Hardware • Issues: • Bandwidth, Compiler Complexity, On Chip Tailoring • Wasted Cycles

  3. What is it? • Originally : Open Microcode • John Cocke (1970’s) • 1980: Simple Set of Simple Instructions • Sequin, Patterson (1980) • 1989: Short, Tight Pipelines • John Hennessy • 1994: VLIW • Wall Street Journal

  4. Characteristics • Fixed Length, Uniform Decode Instructions • No Microcode • Load/Store • Larger Register Set • Delayed Branch • Register Windows

  5. What is it (Non-Technical) • Everything Since 1983 • “Good” • Motorola 68010 Article • Microcoded RISC Article • MicroVAX – 2 • VAX 9000 Literature • SPARC System • The “RISC” Core

  6. Why Did It Happen • Masterful Marketing • Published Berkeley Benchmarks • RISC Chip in Weeks, VAX in Years • Simple is Beatiful • 4-on-floor vs. Automatic • Time-to-Market Curve • VAX 8600 Was Very Late • Track Technology Curve • Why Was it Taken Seriously • HP Bet the Family Store

  7. Comments on the Hype • Simple is Beautiful • Complex Instructions Provide Opportunity for Speed-Up • 1st add Fl.Pt. • Graphics • MMX • Compilers Never Use It • Some BAD Implementations • One Compiler or All Compilers • Published Berkeley Benchmarks • Why did H-P jump in ?

  8. The Players • The University Experiments • RISC (Berkeley, 1980, Patterson, Emphasis on “Simple”) • MIPS (Stanford, 1981, Hennessy, Emphasis on Compiler) • Commercial Products • HP-PA (The IBM Team, Emphasis on Compiler) • SPARC (Berkeley RISC) • MIPS (Simple) • AMD 29000 • Motorola 88000 • IBM RISC System 6000 (Return to Past) • …

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