Install our extension to search inside any video instantly.

Testing if Firefox PowerPC64 JIT actually works (on IBM 970MP Power4)

Added:
725 views45likes1:11:38MoreReneRebeOriginal Release: 2026-07-21

The Firefox PowerPC64 JIT compiler crashes with illegal instruction faults when attempting to use VSX (Vector Scalar Extension) instructions on older PowerPC processors like the IBM 970MP Power4, because these instructions were only introduced with Power8 processors. The JIT compiler must detect hardware capabilities at runtime and generate appropriate machine code, avoiding VSX instructions on older architectures to prevent crashes. This demonstrates the importance of hardware feature detection in JIT compilation and the challenges of supporting legacy hardware in modern software.