On Fri, Dec 30, 2016 at 06:13:24PM -0800, Andy Lutomirski wrote: > Now you call it and ignore the return value and the compiler optimizes > it out :)
Does it, really? It is an inlined asm volatile. I checked all call sites and the CPUID call is there. gcc 6 simply issues the CPUID and then later code overwrites rAX. I.e., it looks ok to me. Or what example scenario do you have in mind? > Also, someone reading the code might scratch their head and > wonder why you picked eax and not ebx, ecx, or edx. We have comments for her/him :-) -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --