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fix: Implement handling of array aliasing in the mem2reg optimization pass #2463

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merged 9 commits into from
Aug 29, 2023

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jfecher
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@jfecher jfecher commented Aug 28, 2023

Description

Problem*

Resolves #2431

Summary*

This is the first of two PRs containing updates to the mem2reg pass. This one expands it to handle array aliasing (primitively - individual elements are not tracked). The next PR implements constant folding within mem2reg and contains the main regression test case which requires both PRs to pass. I've elected to split up the PRs so that the functionality split is a bit clearer and there is less code to review.

Documentation

  • This PR requires documentation updates when merged.

    • I will submit a noir-lang/docs PR.
    • I will request for and support Dev Rel's help in documenting this PR.

Additional Context

PR Checklist*

  • I have tested the changes locally.
  • I have formatted the changes with Prettier and/or cargo fmt on default settings.

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@vezenovm vezenovm left a comment

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Two minor questions about TODOs

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LGTM. Is this issue (#2221) resolved after this PR?

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jfecher commented Aug 29, 2023

@vezenovm, unfortunately not, looks like it needs the constant folding change as well

@jfecher jfecher enabled auto-merge August 29, 2023 17:47
@jfecher jfecher added this pull request to the merge queue Aug 29, 2023
Merged via the queue into master with commit 7123fa9 Aug 29, 2023
16 checks passed
@jfecher jfecher deleted the jf/mem2reg-array-aliasing branch August 29, 2023 18:08
TomAFrench added a commit that referenced this pull request Aug 30, 2023
* master: (42 commits)
  fix(ssa): Handle right shift with constants (#2481)
  chore(noir): Release 0.10.4 (#2354)
  fix: Divide by zero should fail to satisfy constraints for `Field` and ints (#2475)
  fix(ssa): Remove padding from ToRadix call with constant inputs (#2479)
  fix: Implement handling of array aliasing in the mem2reg optimization pass (#2463)
  chore: resolve `Instruction` inputs fully before checking against cache (#2472)
  chore: Move independent `run_test` function into nargo core (#2468)
  feat: Standard library functions can now be called with closure args  (#2471)
  feat(frontend): aztec syntactic sugar (feature flagged) (#2403)
  chore(ci): enforce compliance with `cargo fmt` (#2467)
  chore(ci): Allow releases to have additional feature flags (#2405)
  feat: Add `assert_eq` keyword (#2137)
  fix(ssa): Do not optimize for allocates in constant folding (#2466)
  feat(ssa): Reuse existing results for duplicated instructions with no side-effects (#2460)
  fix: Closure lvalue capture bugfix (#2457)
  feat: Syntax for environment types now works with generics (#2383)
  fix(parser): fixes for the parsing of 'where' clauses (#2430)
  fix: Run `wasm` nodejs tests with no fails (#2387)
  chore: Run `cargo fmt` (#2455)
  chore: Perform formatting changes to integration tests (#2448)
  ...
TomAFrench added a commit that referenced this pull request Aug 30, 2023
* master: (42 commits)
  fix(ssa): Handle right shift with constants (#2481)
  chore(noir): Release 0.10.4 (#2354)
  fix: Divide by zero should fail to satisfy constraints for `Field` and ints (#2475)
  fix(ssa): Remove padding from ToRadix call with constant inputs (#2479)
  fix: Implement handling of array aliasing in the mem2reg optimization pass (#2463)
  chore: resolve `Instruction` inputs fully before checking against cache (#2472)
  chore: Move independent `run_test` function into nargo core (#2468)
  feat: Standard library functions can now be called with closure args  (#2471)
  feat(frontend): aztec syntactic sugar (feature flagged) (#2403)
  chore(ci): enforce compliance with `cargo fmt` (#2467)
  chore(ci): Allow releases to have additional feature flags (#2405)
  feat: Add `assert_eq` keyword (#2137)
  fix(ssa): Do not optimize for allocates in constant folding (#2466)
  feat(ssa): Reuse existing results for duplicated instructions with no side-effects (#2460)
  fix: Closure lvalue capture bugfix (#2457)
  feat: Syntax for environment types now works with generics (#2383)
  fix(parser): fixes for the parsing of 'where' clauses (#2430)
  fix: Run `wasm` nodejs tests with no fails (#2387)
  chore: Run `cargo fmt` (#2455)
  chore: Perform formatting changes to integration tests (#2448)
  ...
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Handle references stored in arrays in new mem2reg pass
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