Lemire confirms wrong-path speculation never crashes on unsupported CPU instructions
lemire · x · 2026-10-05
Daniel Lemire recounts a question from his talk on data parallelism and runtime dispatching: could branch speculation cause a CPU to execute unsupported instructions on the wrong code path and crash? He predicted there would be no crash and no side effects — and happily reports he was right. A light but technical systems-programming anecdote.
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