On Sat, 2023-06-03 at 14:53 +0200, Bernhard Reutner-Fischer wrote: > On 3 June 2023 13:25:32 CEST, Xi Ruoyao via Gcc-patches > <gcc-patches@gcc.gnu.org> wrote: > > > There seems no good way to check if the CPU is Intel or AMD from > > the built-in macros (maybe we can check every known model like > > __skylake, > > __bdver2, ..., but it will be very error-prune and require an update > > whenever we add the support for a new x86 model). The best thing we > > can > > do seems "always try ifunc" here. > > IIRC there is __builtin_cpu_is (after initialisation) -- A couple of > days ago, we wondered if it would be handy to lower that even in > fortran without going through C, so i am pretty sure I don't make that > up.. ;-)
Unfortunately __builtin_cpu_is performs CPU detection on runtime, not compile time. -- Xi Ruoyao <xry...@xry111.site> School of Aerospace Science and Technology, Xidian University
