Today’s Architecture Challenges

• Performance barriers :

  • Memory latency
  • Branches
  • Loop pipelining and call / return overhead

• Headroom constraints :

  • Hardware-based instruction scheduling
    • Unable to efficiently schedule parallel execution
  • Resource constrained
    • Too few registers
    • Unable to fully utilize multiple execution units

• Scalability limitations :

  • Memory addressing efficiency

IA-64 addresses these limitations

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