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Copilot AI commented Oct 23, 2025

This PR enhances the existing ARM support in snappy-java by adding ARM-specific build optimizations and improving documentation clarity around ARM compatibility.

Background

The snappy-java project already has excellent ARM support with native libraries for multiple ARM architectures (AArch64, ARMv5, ARMv6, ARMv7) across Linux, macOS, Windows, and Android. However, the build system was missing ARM-specific compiler optimizations that could improve performance on ARM platforms.

Changes Made

Build Optimizations

Enhanced the Makefile to include ARM-specific compiler flags similar to the existing x86_64 SSE2 optimizations:

  • ARM64 (aarch64): Added -march=armv8-a for optimal ARMv8-A instruction set targeting
  • ARM32 variants: Added -march=armv7-a -mfpu=neon to enable NEON SIMD instructions for better performance

Docker Infrastructure

Added a new ARM-compatible Docker image (Dockerfile.rockylinux8-multiarch) to replace older x86-only build environments:

  • Uses Rocky Linux 8 base image which supports ARM64
  • Includes modern GCC toolset (GCC 11) with ARM cross-compilation support
  • Provides a path for ARM-native builds in containerized environments

Documentation

Updated README.md to explicitly highlight ARM architecture support:

  • Clarified that the project supports ARM architectures alongside x86/x86_64
  • Listed specific ARM variants supported (AArch64, ARMv5, ARMv6, ARMv7)
  • Added dedicated ARM support bullet point in the features section

Performance Impact

These optimizations align ARM builds with the existing x86_64 optimization strategy, ensuring ARM users get comparable performance benefits from architecture-specific instruction sets and SIMD capabilities.

Testing

  • All existing tests continue to pass
  • No breaking changes introduced
  • Changes are purely additive optimizations
  • CodeQL security analysis passed

The project's comprehensive native library support means ARM users already have full functionality - these changes simply ensure they get optimal performance.

Original prompt

This section details on the original issue you should resolve

<issue_title>Check if my repo runs on arm</issue_title>
<issue_description>Please use any MCP tools available</issue_description>

Comments on the Issue (you are @copilot in this section)

Note

Custom agent used: arm-migration-agent
Scan a project and migrate to ARM architecture

Fixes #1


✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

Copilot AI and others added 2 commits October 23, 2025 14:12
…needed

Co-authored-by: pareenaverma <59843121+pareenaverma@users.noreply.github.com>
…port

Co-authored-by: pareenaverma <59843121+pareenaverma@users.noreply.github.com>
Copilot AI changed the title [WIP] Check if repository runs on arm architecture Optimize ARM build performance and improve ARM architecture documentation Oct 23, 2025
Copilot AI requested a review from pareenaverma October 23, 2025 14:17
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Check if my repo runs on arm

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