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| # Storage change status | ||
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| > Analysis of possible storage change status in [EIP-2200] / [EIP-1283]. | ||
| ## Cost constants | ||
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| | Constant | Value | | ||
| | -------- | ----- | | ||
| | SLOAD | 200 | | ||
| | SET | 20000 | | ||
| | RESET | 5000 | | ||
| | CLEARS | 15000 | | ||
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| ## Storage change statuses | ||
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| - `0` - a zero storage value, | ||
| - `X` - non-zero storage value, | ||
| - `Y` - non-zero storage value different from `X`, | ||
| - `Z` - non-zero storage value different form `X` and `Y`, | ||
| - `...` - any value. | ||
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| <table> | ||
| <thead> | ||
| <tr> | ||
| <th>original</th> | ||
| <th>current</th> | ||
| <th>new</th> | ||
| <th>dirty?</th> | ||
| <th>cost</th> | ||
| <th>refund</th> | ||
| </tr> | ||
| </thead> | ||
| <tbody> | ||
| <tr> | ||
| <td>...</td> | ||
| <td>0</td> | ||
| <td>0</td> | ||
| <td rowspan="2">N/A</td> | ||
| <td rowspan="2">200 = SLOAD</td> | ||
| <td rowspan="2">0</td> | ||
| </tr> | ||
| <tr> | ||
| <td>...</td> | ||
| <td>X</td> | ||
| <td>X</td> | ||
| </tr> | ||
| <tr> | ||
| <td>0</td> | ||
| <td>0</td> | ||
| <td>X</td> | ||
| <td>no</td> | ||
| <td>20000 = SET</td> | ||
| <td>0</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>X</td> | ||
| <td>Y</td> | ||
| <td>no</td> | ||
| <td>5000 = RESET</td> | ||
| <td>0</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>X</td> | ||
| <td>0</td> | ||
| <td>no</td> | ||
| <td>5000 = RESET</td> | ||
| <td>15000 = CLEARS</td> | ||
| </tr> | ||
| <tr> | ||
| <td>0</td> | ||
| <td>X</td> | ||
| <td>0</td> | ||
| <td>yes</td> | ||
| <td>200 = SLOAD</td> | ||
| <td>19800 = SET - SLOAD</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>0</td> | ||
| <td>X</td> | ||
| <td rowspan="2">yes</td> | ||
| <td rowspan="2">200 = SLOAD</td> | ||
| <td rowspan="2">-15000 = -CLEARS</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>0</td> | ||
| <td>Y</td> | ||
| </tr> | ||
| <tr> | ||
| <td>0</td> | ||
| <td>X</td> | ||
| <td>Y</td> | ||
| <td rowspan="2">yes</td> | ||
| <td rowspan="2">200 = SLOAD</td> | ||
| <td rowspan="2">0</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>Y</td> | ||
| <td>Z</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>Y</td> | ||
| <td>0</td> | ||
| <td>yes</td> | ||
| <td>200 = SLOAD</td> | ||
| <td>15000 = CLEARS</td> | ||
| </tr> | ||
| <tr> | ||
| <td>X</td> | ||
| <td>Y</td> | ||
| <td>X</td> | ||
| <td>yes</td> | ||
| <td>200 = SLOAD</td> | ||
| <td>4800 = RESET - SLOAD</td> | ||
| </tr> | ||
| </tbody> | ||
| </table> | ||
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| [EIP-1283]: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1283.md | ||
| [EIP-2200]: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-2200.md |