The effect of instruction fetch bandwidth on value prediction

  • Authors:
  • Freddy Gabbay;Avi Mendelson

  • Affiliations:
  • Department of Electrical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel;Department of Electrical Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel

  • Venue:
  • Proceedings of the 25th annual international symposium on Computer architecture
  • Year:
  • 1998

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Abstract

Value prediction attempts to eliminate true-data dependencies by dynamically predicting the outcome values of instructions and executing true-data dependent instructions based on that prediction. In this paper we attempt to understand the limitations of using this paradigm in realistic machines. We show that the instruction-fetch bandwidth and the issue rate have a very significant impact on the efficiency of value prediction. In addition, we study how recent techniques to improve the instruction-fetch rate affect the efficiency of value prediction and its hardware organization.