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FPU structure

FPU structure. Example. Assumptions (to shorten execution trace) 2 instructions dispatched in order per cycle execution begins in same cycle as dispatch result broadcast on CDB in last cycle of execution. Instruction sequence W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6

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FPU structure

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  1. FPU structure

  2. Example • Assumptions (to shorten execution trace) • 2 instructions dispatched in order per cycle • execution begins in same cycle as dispatch • result broadcast on CDB in last cycle of execution • Instruction sequence W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2 • Initial register contents

  3. Cycle 1 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  4. Cycle 2 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  5. Cycle 3 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  6. Cycle 4 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  7. Cycle 5 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  8. Cycle 6 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  9. Cycle 7 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  10. Cycle 8 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

  11. Cycle 9 W: F4 <- F0 + F6 X: F2 <- F0 * F4 Y: F4 <- F4 + F6 Z: F6 <- F4 * F2

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