Cost
The number of multiplexers required for an n-bit word is . Five common word sizes and the number of multiplexers needed are listed below:
- 128-bit —
- 64-bit —
- 32-bit —
- 16-bit —
- 8-bit —
Cost of critical path in FO4 (estimated, without wire delay):
- 32-bit: from 18 FO4 to 14 FO4
Read more about this topic: Barrel Shifter
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