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Testing: Bytecode Equivalence Infrastructure

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

C-testCategory: a change that impacts how or what we testCategory: a change that impacts how or what we test

Status: Open.

#704 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Optimization: Common Subexpression Elimination (CSE)

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

C-perfCategory: an issue highlighting optimization opportunities or PRs implementing suchCategory: an issue highlighting optimization opportunities or PRs implementing such

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#703 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Optimization: Sparse Conditional Constant Propagation (SCCP)

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

C-perfCategory: an issue highlighting optimization opportunities or PRs implementing suchCategory: an issue highlighting optimization opportunities or PRs implementing such

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#702 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Optimization: Constant Folding & Propagation

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

C-perfCategory: an issue highlighting optimization opportunities or PRs implementing suchCategory: an issue highlighting optimization opportunities or PRs implementing such

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#701 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Optimization: Dead Code Elimination (DCE)

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

C-perfCategory: an issue highlighting optimization opportunities or PRs implementing suchCategory: an issue highlighting optimization opportunities or PRs implementing such

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#700 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Lowering: Complete HIR→MIR for Complex Types

A-codegenArea: code generation and MIRArea: code generation and MIR

A-semaArea: semantic analysisArea: semantic analysis

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

Status: Open.

#699 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Codegen: Assembler Label & Jump Resolution

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#698 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Codegen: Full Stack Scheduling with Spilling

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

P-highHigh priorityHigh priority

Status: Open.

#697 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Codegen: Stack Model & Basic Scheduling (≤16 values)

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-hardCall for participation: Hard difficulty. Experience needed to fix: A lot.Call for participation: Hard difficulty. Experience needed to fix: A lot.

P-highHigh priorityHigh priority

Status: Open.

#696 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Codegen: Phi Elimination Pass

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#695 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

MIR Codegen: Liveness Analysis

A-codegenArea: code generation and MIRArea: code generation and MIR

C-enhancementCategory: an issue proposing an enhancement or a PR with oneCategory: an issue proposing an enhancement or a PR with one

E-mediumCall for participation: Medium difficulty. Experience needed to fix: Intermediate.Call for participation: Medium difficulty. Experience needed to fix: Intermediate.

Status: Open.

#694 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026

Roadmap: Bytecode Equivalence Testing & New IR Design

A-codegenArea: code generation and MIRArea: code generation and MIR

C-tracking-issueCategory: an issue that collects information about a broad development initiativeCategory: an issue that collects information about a broad development initiative

Status: Open.

#687 In paradigmxyz/solar;

· gakonst opened on Jan 14, 2026