[PATCH 5/6] include: Add __rdtsc and __rdtscp intrinsics.

[Rémi Bernon]

On 3/10/21 9:44 PM, Jacek Caban wrote:
> On 10.03.2021 17:13, Rémi Bernon wrote:
>> Apparently clang >= 4.0.0 has __rdtsc (but not __rdtscp). Can we just 
>> assume clang >= 4.0.0 is used and something like that would be 
>> acceptable instead?
> 
> 
> There is __has_builtin(), which would be cleaner in this case, IMHO.
> 
> 
> Both compilers ship __rdtscp in ia32intrin.h header (gcc also __rdtscp, 
> which clang doesn't need). I was considering something like this inside 
> our intrin.h:
> 
> 
> #if defined(__i386__) || defined(__x86_64__)
> 
> # include <x86intrin.h>
> 
> #endif
> 
> 
> I believe that this should solve your problem. This rises some 
> compatibility concerns, but I think it may be fine. It's shipped with 
> compilers themselves for all platforms (not by mingw-w64).
> 
> 
> Jacek
> 

Ah yes sure, I didn't know these were available in intel intrinsic 
headers. I guess that would be perfect then.
-- 
Rémi Bernon <rbernon at codeweavers.com>