On 2018-07-08 12:46 -0400, Dennis Clarke wrote: > On 07/08/2018 12:36 PM, U.Mutlu wrote: > > Dennis Clarke wrote on 07/08/2018 03:44 PM: > > > > > > As seen at : > > > > > > https://gcc.gnu.org/onlinedocs/gcc/x86-Built-in-Functions.html > > > > > > > > > The example there seems to suggest that I could do this : > > > > > > > > > __builtin_cpu_init (); > > > if ( __builtin_cpu_is ("corei7") ){ > > > fprintf ( stdout, "Intel Core i7 CPU. \n" ); > > > } else { > > > fprintf ( stdout, " NOT Intel Core i7 CPU. \n" ); > > > } > > > > > > > > > However I get an odd result from my Debian machine here when I try to > > > check for every possible option : > > > > Just guessing: are you maybe calling __builtin_cpu_init() multiple times? > > Though it shouldn't make a difference, IMO. > > Tried that once before calling "__builtin_cpu_is" and also tried it > every time and it makes no difference. GCC actually "think" Pentium G and Core i3/i5 are Core i7 because they support instructions of Core i7. -- Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
