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scan assignment value in drop_unused() (#1578)

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those were not optimised for `unused` before, which made it necessary for `reduce_vars` to have separate steps for `keep_fnames`

docs update by @kzc

closes #1577
This commit is contained in:
Alex Lam S.L
2017-03-08 18:37:32 +08:00
committed by GitHub
parent 344d11d591
commit 711f88dcb4
3 changed files with 30 additions and 8 deletions
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@@ -391,11 +391,11 @@ to set `true`; it's effectively a shortcut for `foo=true`).
- `cascade` -- small optimization for sequences, transform `x, x` into `x`
and `x = something(), x` into `x = something()`
- `collapse_vars` -- default `false`. Collapse single-use `var` and `const`
definitions when possible.
- `collapse_vars` -- Collapse single-use `var` and `const` definitions
when possible.
- `reduce_vars` -- default `false`. Improve optimization on variables assigned
with and used as constant values.
- `reduce_vars` -- Improve optimization on variables assigned with and
used as constant values.
- `warnings` -- display warnings when dropping unreachable code or unused
declarations etc.