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Most important feature of instruction set design -
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make opcodes easy to decode.
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The easiest way to do this -
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break up the opcode into several different bit fields.
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Opcode fields:
| <<< | Index | Encoding The Opcodes >>> |
Since opcodes are submitted to the decoder circuits, encoding opcodes is quite more involved rather than just assigning numbers.
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Each field is contributing part of the information necessary to execute the full instruction.
The smaller the bit fields, the easier it is for hardware to decode them.
| <<< | Index | Encoding The Opcodes >>> |