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Updated Dataset block generation algorithm specification

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tevador 2019-03-15 22:43:23 +01:00
parent edde7672e0
commit 6061848444
1 changed files with 9 additions and 6 deletions
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doc/specs.md
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@ -626,12 +626,15 @@ Dataset blocks are numbered sequentially with `blockNumber` starting from 0. Eac
The block data is arranged into 8 columns of 64-bit unsigned integers: `c0`-`c7`.
1. Set `c0`to `4 * blockNumber`,
1. Set `c1`-`c7` to zero.
1. Load a 64-byte block from the Cache. the block index is given by `c0` modulo the total number of blocks in Cache.
1. Set `c0 = SquareHash(c0)`
1. XOR all columns with the 64 bytes loaded in step 3 (8 bytes per column).
1. Repeat steps 3-5 total of `RANDOMX_CACHE_ACCESSES` times.
1. Set column `c0` to `blockNumber`.
1. Set columns `c1`-`c7` to zero.
1. Let `i = 0`
1. Let `currentColumn` be column with index `i` (wraps around if `i > 7`).
1. Let `nextColumn` be column with index `i + 1` (wraps around if `i > 6`).
1. Load a 64-byte block from the Cache. The block index is given by `currentColumn` modulo the total number of blocks in Cache.
1. Set `nextColumn = SquareHash(currentColumn + nextColumn)`
1. XOR all columns with the 64 bytes loaded in step 6 (8 bytes per column in order `c0`-`c7`).
1. Set `i = i + 1` and go back to step 4 if `i < RANDOMX_CACHE_ACCESSES`.
1. Concatenate columns `c0`-`c7` in little endian format to get the final block data.
### 6.5 Dataset size