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docs(yellowpaper): update cast instruction description with truncation operation #3621

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Dec 7, 2023
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docs(yellowpaper): update cast instruction description with truncation operation #3621

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2 changes: 1 addition & 1 deletion yellow-paper/docs/public-vm/gen/_InstructionSet.mdx
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Expand Up @@ -710,7 +710,7 @@ Type cast
- **aOffset**: memory offset of word to cast
- **dstOffset**: memory offset specifying where to store operation's result
- **Expression**: `M[dstOffset] = cast<dst-tag>(M[aOffset])`
- **Details**: Cast a word in memory based on the `dst-tag` specified in the bytecode. Truncates when casting to a smaller type, left-zero-pads when casting to a larger type. See [here](./state-model#cast-and-tag-conversions) for more details.
- **Details**: Cast a word in memory based on the `dst-tag` specified in the bytecode. Truncates (`M[dstOffset] = M[aOffset] mod 2^dstsize`) when casting to a smaller type, left-zero-pads when casting to a larger type. See [here](./state-model#cast-and-tag-conversions) for more details.
- **Tag updates**: `T[dstOffset] = dst-tag`
- **Bit-size**: 96

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2 changes: 1 addition & 1 deletion yellow-paper/src/preprocess/InstructionSet/InstructionSet.js
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Expand Up @@ -279,7 +279,7 @@ const INSTRUCTION_SET_RAW = [
],
"Expression": "`M[dstOffset] = cast<dst-tag>(M[aOffset])`",
"Summary": "Type cast",
"Details": "Cast a word in memory based on the `dst-tag` specified in the bytecode. Truncates when casting to a smaller type, left-zero-pads when casting to a larger type. See [here](./state-model#cast-and-tag-conversions) for more details.",
"Details": "Cast a word in memory based on the `dst-tag` specified in the bytecode. Truncates (`M[dstOffset] = M[aOffset] mod 2^dstsize`) when casting to a smaller type, left-zero-pads when casting to a larger type. See [here](./state-model#cast-and-tag-conversions) for more details.",
"Tag checks": "",
"Tag updates": "`T[dstOffset] = dst-tag`",
},
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