v0.1.13

NexusFIX v0.1.13

simdjson-Style Two-Stage Structural Indexing

Highlights

• 77% faster ExecutionReport parsing (207 ns -> 47 ns P50)
• Two-stage SIMD pipeline: structural index + lazy O(1) field extraction
• Runtime dispatch: AVX-512 / AVX2 / scalar fallback

Performance

ExecutionReport Parse (169 bytes)

Metric	Before	After	Improvement
P50	207.17 ns	46.82 ns	77.4% faster
Mean	208.24 ns	47.43 ns	77.2% faster
P99	217.99 ns	60.86 ns	72.1% faster

Throughput by Message Size

Message	Size	Latency	Throughput
Heartbeat	78 B	38.6 ns	2.02 GB/s
NewOrderSingle	158 B	53.3 ns	2.97 GB/s
ExecutionReport	169 B	50.9 ns	3.32 GB/s

What's New

• simdjson-inspired two-stage FIX parser
  • Stage 1: SIMD scan builds structural index of all delimiter positions
  • Stage 2: Lazy field extraction via direct index lookup (~2.3 ns/field)

Bug Fixes

• Fix Windows MSVC CI: suppress C4324 alignment warning for intentional alignas; replace deprecated std::getenv() with MSVC-safe alternative

Full Changelog: v0.1.12...v0.1.13