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More precise value analysis for "known integer or Vundef" results #520

Merged
merged 2 commits into from
Aug 22, 2024
Merged

More precise value analysis for "known integer or Vundef" results #520

merged 2 commits into from
Aug 22, 2024

Commits on Aug 21, 2024

  1. Value analysis: add IU ("known integer or Vundef") static value 

    This improves analysis precision for comparisons and selections.
    @xavierleroy
    xavierleroy committed Aug 21, 2024
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  2. Constant propagation: optimize "known integer or Vundef" results 

    Results that analyze to `IU n` are turned into
`load-integer-immediate(n)` operations.

This is semantically safe, and enables compile-time evaluation of some
pointer comparisons (e.g. `&x == &x` where `x` is a global variable or
a stack-allocated variable).
    @xavierleroy
    xavierleroy committed Aug 21, 2024
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