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Move constancy into Dynamic.

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Stephen Chung
2020-12-08 22:47:38 +08:00
parent 8e8069f819
commit f22a04fc74
14 changed files with 501 additions and 430 deletions
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8
doc/src/engine/optimize/optimize-levels.md
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@@ -11,6 +11,14 @@ There are three levels of optimization: `None`, `Simple` and `Full`.
(i.e. it only relies on static analysis and [built-in operators] for constant [standard types],
and will not perform any external function calls).
However, it is important to bear in mind that _constants propagation_ is performed with the
caveat that, if [constants] are modified later on (yes, it is possible, via Rust functions),
the modified values will not show up in the optimized script. Only the initialization values
of [constants] are ever retained.
Furthermore, overriding a [built-in operator][built-in operators] in the [`Engine`] afterwards
has no effect after the optimizer replaces an expression with its calculated value.
* `Full` is _much_ more aggressive, _including_ calling external functions on constant arguments to determine their result.
One benefit to this is that many more optimization opportunities arise, especially with regards to comparison operators.