Representation Optimization & ARC Intelligence

12 sections

70%
Section 1 Representation IR & Decision Framework Section 2 Transitive Triviality & ARC Elision Section 3 Value Range Analysis Framework Section 4 Integer Narrowing Pipeline Section 5 Float Narrowing Pipeline Section 6 Struct & Tuple Layout Optimization Section 7 Enum Representation Optimization Section 8 Escape Analysis & Stack Promotion Section 9 ARC Header Compression Section 10 Thread-Local Non-Atomic ARC Section 11 Collection Specialization Section 12 Verification & Benchmarks
Overview

Complete the representation optimization system as one cohesive machine: from abstract types through range analysis and escape analysis to optimally-narrowed LLVM IR, with ARC header compression and thread-local fast paths — making Ori's generated code competitive with hand-written C while the programmer never sees a bit width.

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In Progress

1 sections
Section 7 In Progress

Enum Representation Optimization

Optimize enum layout with niche filling, discriminant narrowing, tagged pointers, and payload compression — matching Rust's enum layout optimizations

66/130 tasks
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Planned

5 sections
Section 8 Not Started

Escape Analysis & Stack Promotion

Determine which heap allocations never escape their defining function and promote them to stack allocations, eliminating ARC overhead entirely

0/63 tasks
Section 9 Not Started

ARC Header Compression

Specialize RC count storage and operations from the V5 header based on proven sharing bounds, using a genuinely smaller-than-32-byte header for bounded-count variants

0/40 tasks
Section 10 Not Started

Thread-Local Non-Atomic ARC

Use non-atomic (plain load/store) reference counting for values that are provably never shared across threads, eliminating atomic operation overhead

0/46 tasks
Section 11 Not Started

Collection Specialization

Optimize collection representations: small string optimization (SSO), small vector optimization (SVO), packed bool arrays, and narrow-element backing stores

0/50 tasks
Section 12 Not Started

Verification & Benchmarks

Prove correctness and measure performance of all representation optimizations through exhaustive testing, dual-execution verification, memory safety validation, and performance benchmarks

0/82 tasks
✓

Completed

6 sections
Section 1 Complete

Representation IR & Decision Framework

Create the ReprPlan data structure that records all narrowing decisions, integrated into the compilation pipeline between type checking and LLVM codegen

202/202 tasks
Section 2 Complete

Transitive Triviality & ARC Elision

Classify compound types as trivial when all transitive children are scalar, eliding all ARC operations for these types

102/102 tasks
Section 3 Complete

Value Range Analysis Framework

Build an abstract interpretation engine over integer intervals that computes provable value ranges for every int-typed expression in a function

169/169 tasks
Section 4 Complete

Integer Narrowing Pipeline

Lower int (semantic i64) to the smallest machine integer (i8/i16/i32) that preserves correctness, saving memory in struct fields, collections, and stack slots

108/108 tasks
Section 5 Complete

Float Narrowing Pipeline

Lower float (semantic f64) to f32 when the compiler can prove zero precision loss for the specific values used

74/74 tasks
Section 6 Complete

Struct & Tuple Layout Optimization

Reorder struct fields for optimal alignment and minimal padding, then record the layout in ReprPlan for codegen

67/67 tasks