>>>>> "ILT" == Ian Lance Taylor <iant@xxxxxxxxxx> writes: JC>> Does anyone have a worked example in C of using attribute ifunc to JC>> dispatch over the various x86 SSE/AVX flags, as well as arm neon? ILT> For your case you need to write foo_ifunc using appropriate asm ILT> instructions to check cpuid or whatever. Thanks, but that much I already got out of the docs. I was hoping for an example of actual checks for the various cpu features for x86 & arm in the ifunc context. The existing cpu feature detectors out in the wild, plus the i+a+v docs, should provide enough extra clue, of course. Just a matter of coding, after all. ILT> At present you have to call it manually. There is an outstanding patch ILT> to add __builtin_cpuid on x86 systems, but I don't think it has been ILT> approved. That would be a useful addition. Thank you. -JimC -- James Cloos <cloos@xxxxxxxxxxx> OpenPGP: 1024D/ED7DAEA6
