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Another round of speculative-execution vulnerabilities

Another round of speculative-execution vulnerabilities

Posted Aug 9, 2023 14:00 UTC (Wed) by eru (subscriber, #2753)
In reply to: Another round of speculative-execution vulnerabilities by willy
Parent article: Another round of speculative-execution vulnerabilities

When was speculation added to Intel CPU:s? My guess is after Pentium 4.

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Another round of speculative-execution vulnerabilities

Posted Aug 9, 2023 14:30 UTC (Wed) by excors (subscriber, #95769) [Link]

It was before the Pentium 2 - specifically the Pentium Pro (launched in 1995) had out-of-order and speculative execution with a 20-30 instruction window (according to the Pentium Pro Family Developer's Manual). The original Pentium had branch prediction for speculative code fetch but no speculative execution.

Another round of speculative-execution vulnerabilities

Posted Aug 9, 2023 14:32 UTC (Wed) by farnz (subscriber, #17727) [Link]

The last Intel x86 CPU with no speculative execution at all was the 80486. The Pentium (in 1993) had a very limited amount of speculative execution driven by a dynamic branch predictor, and it's just grown from then on.


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