Illegal instruction on Raspberry Pi 4 (ARMv8)

[feiticeir0]

Environment

• Device: Raspberry Pi 4 (2GB) - Raspberry Pi 4 Model B Rev 1.2
• OS: Raspberry Pi OS Lite (64-bit)
• Architecture: ARMv8 (aarch64)
• Cactus version: latest main

Steps to reproduce

1. cactus build --python
2. cactus run Qwen/Qwen3-0.6B --precision INT4
3. cactus run Qwen/Qwen3.5-0.8B --precision INT4

Result

Illegal instruction

Expected

Model runs as on Raspberry Pi 5

Notes

Raspberry Pi 5 is ARMv8.2, Raspberry Pi 4 is ARMv8.0.
Likely compiled with instructions not supported on ARMv8.0.
Benchmarks on your README only show RPi 5 — is RPi 4 officially supported?

[yujonglee]

The current native build is compiled with an ARMv8.2+ baseline (-march=armv8.2-a+fp16+simd+dotprod+i8mm), so it assumes CPU features beyond ARMv8.0. That makes an Illegal instruction on Pi 4 expected.

[asuzukosi]

@yujonglee are there any plans to include builds for ARM below 8.2 or should this issue be closed?

[yujonglee]

@HenryNdubuaku thoughts? :)