July 2026 — xlsynth/xlsynth-crate: - Delivered NLPM Power Model for GV-Eval with dynamic power analysis and Enhanced CLI. The feature computes per-pin transition histograms (up/down slews) for a given input transition and uses the Liberty NLPM model to produce weighted dynamic power values, significantly improving accuracy of power estimations in digital designs. CLI now exposes power outputs and diagnostics to streamline analysis and integration into design workflows. - PR/Change reference: commits include 15e336d66eadb7dad430d90fefdbc813bda8d6a9 (Add NLPM power model to gv-eval) and is associated with PR #1031.

June 2026 (2026-06) monthly summary for xlsynth-crate. Delivered a broad set of high-impact features across the IR, AOT, and tooling layers, accompanied by reliability and performance fixes that strengthen end-to-end design workflows. Notable achievements include IR/IR-eval enhancements (zero-width bitvectors and IR invoke support; counted_for in IR eval and compiler), extensive AOT enhancements (new AOT compiler, zero-bit/TryFrom support, event collection options/benchmarks, cleanup, and removal of legacy infra), new g8r tooling (g8r-stitch-pipeline, g8r-eval, and g8r-optimize), Liberty/Netlist improvements and versioned releases, and targeted fuzzing improvements. These changes collectively enable faster, more robust builds, improved testing coverage, and a cleaner, more scalable codebase, aligning with business goals of reliability, performance, and faster time-to-market.

May 2026 (xlsynth-crate). Delivered substantial feature work, reliability improvements, and infrastructure upgrades across the XLSynth toolchain. Focused on scalable design transforms, reliable netlist handling, and faster, deterministic tooling for design exploration and verification. Key features and robustness improvements: - Scalable cutdb: extended to handle larger cuts with a four-phase transformation and incremental optimization; introduced dynamic_structural_hash and dynamic_depth for precise node counting and fast incremental updates; achieved meaningful gains in delay/area across large benchmarks. - Cranelift-backed PIR compiler: introduced a JIT-based Cranelift backend with potential for AOT, delivering competitive performance and much faster compilation paths. - AIG toggle measurement and synthetic input generation: added AIG toggle measurement in aig-eval, plus deterministic synthetic input generation for IR functions. - Enhanced GV tooling: added gv-area and gv-stats subcommands and alias support in gv-sta, enabling more accurate area/delay reporting and streamlined timing analysis. - IR/Compiler verification and coverage: expanded IR verification to better align with XLS behavior; extended IR compiler to support cover/trace/assert, withWide operations support and assumed_in_bounds annotations. - Additional robustness and flow improvements: improved array index lowering for identical-element arrays; fixed netlist parsing issues and introduced a normalization pass; unified AIG/AAG emission ordering; added a flag to disable extern_verilog handling; introduced ext_normalize_left for PIR normalization. - Infrastructure and ecosystem: upgraded crate versions (0.50→0.51), switched default solver to Bitwuzla, and expanded random IR generator to cover more ops (assert/trace/cover). Business value and impact: - Reduced design cycle time through faster JIT-style compilation and more predictable, deterministic IR generation. - Improved area/delay tradeoffs and scalability in large designs via scalable cutdb and reassociation pass. - Hardened netlist handling and verification that align more closely with XLS behaviors, reducing rework in downstream flows. - More robust and extensible tooling (GV, libxls aliasing, AIG/AAG emission consistency) that enable smoother integration with existing flows and benchmarks.

April 2026 monthly summary for repo: xlsynth/xlsynth-crate. Focused on boosting reliability, QoR, and hardware coverage across MCMC sampling, IR encoding, arithmetic optimization, and testing pipelines. Delivered capabilities that improve design space exploration efficiency, broaden hardware target support, and streamline validation. Key highlights include cross-cutting improvements to sampling, IR/arithmetics, and testing, with concrete commits enabling higher quality synth results and faster iteration.

March 2026 highlights for xlsynth/xlsynth-crate: Core HL enhancements, expanded IR/FFI tooling, broader arithmetic capabilities, stronger equivalence verification, and CI publishing improvements, with performance and maintainability gains across the pipeline. Alignments include Rust 2024 extern/C safety, unified compile paths, and reliable end-to-end fidelity for serialized IR. Notable stability fixes also addressed IR roundtrip fallbacks and fuzz-related reliability.

February 2026 monthly summary for xlsynth-crate focusing on PIR enhancements, netlist parsing/improvements, block-to-function optimization, and AOT compilation. Delivered robust register handling and instantiation in PIR, improved netlist-to-XLS IR pipeline (with gated clocks and port-order fixes), inline block-to-function conversion with cycle-awareness and IO simplifications, and initial AOT-capable build-time object code integration. These efforts enhance netlist ingestion accuracy, IR quality, runtime performance, and build-time efficiency.

January 2026 performance summary: Focused on expanding hardware design expressiveness and ensuring release integrity. In xlsynth-crate, delivered VAST framework enhancements enabling unpacked arrays and conditional logic/loops in Verilog generation, broadening data structure flexibility and generation capabilities (commits 439ede0bbcd5ebfcbc943268f7021272dc8ee916; 0f9c7131a490f11c9da304d0ca81bf86c2b0e8ad). Also updated version compatibility metadata to align with release 0.25.0 and address a failed publish action, ensuring correct crate version tracking and release dates (commit cde6450accdf22a0467be92d29aac9f131109c00). In google/xls, introduced adaptive Verilog code generation with conditionals inside generate loops/modules to support if-then-else logic in hardware descriptions (commit 631d35ad04a8decfb05a9a97e9adb94f077e96d2). Impact: broader hardware design expressiveness, improved reliability of release metadata, and faster iteration for conditional hardware generation. Technologies demonstrated: VAST API enhancements, Verilog generation, conditional logic, version compatibility tooling, and release process discipline.

2025-12 Monthly summary for xlsynth/xlsynth-crate. Delivered API usability and Verilog generation enhancements, aligned with the latest library release to improve downstream integration and documentation. Focused on delivering concrete features that increase developer velocity and code clarity, with tests to verify correctness.

Month 2025-11: Delivered a suite of VAST-based enhancements across google/xls and xlsynth-crate that improve Verilog generation flexibility, API ergonomics, and hardware-design versatility. Focused on explicit width handling, modernized generate loops, and extended cast semantics, while expanding macro support and API readability. This enables more predictable, maintainable Verilog output and faster feature delivery with clearer APIs.

October 2025 focused on delivering a major performance uplift for GED processing and broadening SystemVerilog support, accompanied by clear release documentation. Key work spanned algorithmic optimization, SV feature expansion, and metadata updates to support the crate release, with a strong emphasis on business value through faster graph edits and broader language coverage.

2025-09 monthly summary for google/xls: Focused on reliability, determinism, and testing. Delivered three key items: (1) Deterministic emission order in code generation using residual data with a stable topological sort, including new tests; (2) QuickCheck testing framework refactor that decouples the evaluator and adds a new interpretive flag to enable quickchecks with the IR interpreter, improving testing flexibility and correctness; (3) IR for-loop activation-bit correctness fix to prevent spurious asserts and unintended side effects, with an accompanying regression test. Each item has associated commits and tests, reinforcing maintainability and coverage.

August 2025 delivered concrete business value across google/xls by stabilizing code generation, improving observability, and strengthening tooling integration. The changes improve deterministic Verilog output, reduce debugging time through detailed evaluator traces, and enhance UI/tooling accuracy with compile_commands.json generation, while maintaining a clean codebase and optimized transforms.