[NFC-ish] Remove LocalGraph from LocalSubtyping #6921
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tlively
approved these changes
Sep 10, 2024
| // If we ever optimized, then we also need to do a final pass to update any | ||
| // unreachable gets and tees. They are not seen or updated in the above | ||
| // analysis, but must be fixed up for validation to work. | ||
| if (optimized) { |
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The LocalGraph there was used for two purposes:
It is trivial to get all the gets and sets in a much faster way, by just walking the
code as this PR does. The downside is that we also consider unreachable gets
and sets, so unreachable code can prevent us from optimizing, but that seems
worthwhile as many passes make that assumption (and they all become
maximally effective after --dce).
Removing LocalGraph + the fixup code for unreachability makes this
significantly shorter, and also 2-3x faster.