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gchatelet avatar gchatelet commented on May 3, 2024

x86 provides all the information you need via the cpuid instruction and it is quite fast (a few hundreds of cycles). Using /proc/cpuinfo requires to read the file system and parse text which is both more error prone and slower. This can be added for sure but is it worth it?

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Happy-Ferret avatar Happy-Ferret commented on May 3, 2024

Ah! Thanks. I didn't even see that line (not that it's an excuse, but I'm having some troubles with my right eye today. Urgh).

Yea. Definitely no point then.

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gchatelet avatar gchatelet commented on May 3, 2024

Happy to help!

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Myriachan avatar Myriachan commented on May 3, 2024

Whether SSE (XMM register saving) is supported by the OS is the one thing that x86 doesn't expose, unless the CPU also has AVX (via the XCR0 register). Detecting this, if it's worth bothering, requires reading /proc/cpuinfo on Linux x86-32. (x86-64's definition requires the OS to support XMM register saving, so x86-64 user-mode code can assume SSE and SSE2 support.)

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