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zherczeg / sljit

Platform independent low-level JIT compiler
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x86: check for extended function availability before using #255

Closed carenas closed 4 months ago

carenas commented 4 months ago

Protect against oldest CPUs that might leave bogus values after cpuid affecting the feature detection.

The "bug" for leaf 1 could affect several old CPUs as it matches the original specification for cpuid, possibly including:

AMD (Am486 DX2/DX4, Am5x86, K5) Centaur (WinChip C6, Winchip 2) NexGen (Nx586) Cyrix (Cx486DX2/DX4, 5x86, 6x86, 6x86MX, MII)