The FEX-2605 release significantly enhances performance for legacy x87 and SSE math routines while addressing bugs that caused game stutters and crashes. It resolves a race condition on ARM64ec systems affecting controller input during WINE or Proton usage and introduces early support for the Snapdragon X2 Elite platform. Key optimizations include faster execution of floating-point operations and corrections to CPU flag settings, which prevent performance issues in older titles. Additionally, the update improves split-lock emulation for atomic memory operations on Qualcomm processors, ensuring smoother gameplay and better compatibility with legacy software
FEX-2605 released
FEX-2605 delivers major performance gains for legacy x87 and SSE math routines while patching flag and segment register bugs that previously caused game stutters or crashes. The release also fixes a race condition on ARM64ec systems that triggered controller input failures when running WINE or Proton. Early Snapdragon X2 Elite support is included, with developers adjusting for hardware quirks like non-standard cycle counters and disabled RNG features. Most importantly, the update refines split-lock emulation by raising cache line thresholds to prevent SIGBUS crashes during atomic memory operations on Qualcomm processors.
