refactor: runtime detect simd features

[Brooooooklyn]

The sonic-simd crate detects SIMD features at compile time, which is inconvenient for binary distribution.

This PR copies the source code from sonic-rs and refactors it to include runtime SIMD feature detection. The implementation is not elegant but functions effectively.

[Brooooooklyn]

• refactor: runtime detect simd features #29 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #29 will degrade performances by 7.11%

_{Comparing 10-12-refactor_runtime_detect_simd_features (6a3bf55) with main (4a7dad2)}

Summary

❌ 1 regression
✅ 2 untouched
⏩ 9 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Mode	Benchmark	BASE	HEAD	Change
❌	Instrumentation	short string escape simd	2.2 µs	2.4 µs	-7.11%

Footnotes

1. 9 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[Copilot]

Pull Request Overview

Refactors the codebase to implement runtime SIMD feature detection by copying and adapting source code from sonic-rs, replacing the compile-time detection provided by the sonic-simd crate. This enables better binary distribution compatibility across different hardware platforms.

• Adds local SIMD abstraction modules for different architectures (SSE2, AVX2, AVX512, NEON, and generic fallback)
• Implements runtime feature detection using is_x86_feature_detected! and is_aarch64_feature_detected!
• Refactors the main escape function to dynamically select SIMD implementations based on available CPU features

Reviewed Changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/simd/traits.rs	Defines portable SIMD traits and interfaces
src/simd/v128.rs	Generic 128-bit SIMD implementation as fallback
src/simd/sse2.rs	SSE2-specific SIMD implementation for x86/x86_64
src/simd/neon.rs	NEON-specific SIMD implementation for AArch64
src/simd/mod.rs	Module organization for SIMD implementations
src/simd/bits.rs	Bitmask utilities and implementations
src/simd/avx512.rs	AVX512-specific SIMD implementation
src/simd/avx2.rs	AVX2-specific SIMD implementation
src/simd/README.md	Documentation for the SIMD module
src/lib.rs	Main library refactored for runtime SIMD detection
benches/escape.rs	Added correctness assertions in benchmarks
Cargo.toml	Removed sonic-simd dependency and added debug symbols

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