Fpstate - Vso

What is FPState?

FPState (Floating-Point State) refers to the collection of registers and control bits that a CPU uses to perform floating-point arithmetic. This includes:

6. How to check if your system uses FPState VSO

On Linux (x86_64):

• Typical FPState includes control/status registers (e.g., x87 control word, status word), tag word, instruction/data pointers, MXCSR (SSE control/status), and wide register file (XMM/YMM/ZMM).
• A VSO wrapper may add fields such as:

  7. Final Verdict

  | Criteria | Rating (out of 10) | |----------|--------------------| | Performance | 7/10 (minor branch overhead) | | Memory Efficiency | 9/10 | | Security | 8/10 (safe if other mitigations on) | | Developer Friendliness | 2/10 (kernel-only, high complexity) | | Documentation Quality | 4/10 (scattered in LKML, no central guide) | fpstate vso