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Merge pull request #13501 from ethereum/document-unused-store-eliminator

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Document UnusedStoreEliminator
This commit is contained in:
Nikola Matić
2022-10-21 07:06:20 -05:00
committed by GitHub
parent db86a730fe 9e505bd128
commit b205fe8494
2 changed files with 57 additions and 3 deletions
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libyul/optimiser/UnusedStoreEliminator.h
+9 -2
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@@ -39,8 +39,15 @@ struct Dialect;
struct AssignedValue;
/**
* Optimizer component that removes sstore statements if they
* are overwritten in all code paths or never read from.
* Optimizer component that removes sstore and memory store statements if conditions are met for their removal.
* In case of an sstore, if all outgoing code paths revert (due to an explicit revert(), invalid(),
* or infinite recursion) or lead to another ``sstore`` for which the optimizer can tell that it will overwrite the first store,
* the statement will be removed.
*
* For memory store operations, things are generally simpler, at least in the outermost yul block as all such statements
* will be removed if they are never read from in any code path. At function analysis level however, the approach is similar
* to sstore, as we don't know whether the memory location will be read once we leave the function's scope,
* so the statement will be removed only if all code code paths lead to a memory overwrite.
*
* The m_store member of UnusedStoreBase is only used with the empty yul string
* as key in the first dimension.