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Correlation Between State and Control Signals in Out-of-order Issue Logic

This update highlights the data collected for individual instruction consistency, PC Fetch vs Issue Window consistency, register renaming, and instruction repetition. It also discusses challenges faced in collecting large pipetraces and rewriting tools for larger pipetraces.

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Correlation Between State and Control Signals in Out-of-order Issue Logic

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  1. Correlation Between State and Control Signals in Out-of-order Issue Logic Checkpoint 2: 11/21/00 Kenneth Barr Kenneth Conley Serhii Zhak

  2. Status Update • Highlights • Data for individual instruction consistency • Data for PC_Fetch vs. Issue Window consistency • Data for register renaming • Data for instruction repetition • Lowlights • Hard to collect large pipetraces • Spent a lot of time rewriting tools to support larger pipetraces • Repetition of research

  3. Renaming Results 0.90 0.80 0.70 Mapped to 0.60 Original Mapping 0.50 Fraction 0.40 Could Map to 0.30 Original Mapping 0.20 0.10 0.00 li go cc1 m88 perl vortex ijpeg compress Benchmark

  4. Individual Instruction Consistency

  5. Fetch_PC vs. Issue Window Consistency

  6. The Road to the Finish Line • Issue Oracle • Verify functionality • Collect data • Compare results against expected results (consistency data) • Test different oracle prediction rules • Renaming • Collect data for forced renaming • Consistency Data • Greater variety of traces

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