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

[Rémi Bernon]

On 3/10/21 3:57 PM, Jacek Caban wrote:
> Hi Rémi,
> 
> On 10.03.2021 12:22, Rémi Bernon wrote:
>> Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
>> ---
>>   include/msvcrt/intrin.h | 30 ++++++++++++++++++++++++++++++
>>   1 file changed, 30 insertions(+)
>>
>> diff --git a/include/msvcrt/intrin.h b/include/msvcrt/intrin.h
>> index 781c6fac823..061866fe63b 100644
>> --- a/include/msvcrt/intrin.h
>> +++ b/include/msvcrt/intrin.h
>> @@ -20,6 +20,36 @@ static inline void __cpuid(int info[4], int ax)
>>   {
>>       return __cpuidex(info, ax, 0);
>>   }
>> +
>> +#ifdef __i386
>> +static inline unsigned __int64 __rdtsc(void)
>> +{
>> +    unsigned __int64 a;
>> +    __asm__ ("rdtsc" : "=A" (a));
>> +    return a;
>> +}
>> +
>> +static inline unsigned __int64 __rdtscp(unsigned int *aux)
>> +{
>> +    unsigned __int64 a;
>> +    __asm__ ("rdtscp" : "=A" (a), "=c" (*aux));
>> +    return a;
>> +}
>> +#elif defined __amd64
>> +static inline unsigned __int64 __rdtsc(void)
>> +{
>> +    unsigned __int64 a, d;
>> +    __asm__ ("rdtsc" : "=a" (a), "=d" (d));
>> +    return (d << 32) | a;
>> +}
>> +
>> +static inline unsigned __int64 __rdtscp(unsigned int *aux)
>> +{
>> +    unsigned __int64 a, d;
>> +    __asm__ ("rdtscp" : "=a" (a), "=d" (d), "=c" (*aux));
>> +    return (d << 32) | a;
>> +}
>> +#endif
>>   #endif
> 
> 
> I think you meant __i386__ and __x86_64__ for guards. If guards were 
> right, you'd get a redefinition because __rdtsc is a compiler builtin. 
> It seems to me that all we need for __rdtsc is to provide MSVC-style 
> declaration in winnt.h, like it's done in WinSDK.
> 
> 
> Thanks,
> 
> Jacek
> 

Yeah I'm not sure where I got these guards from, but I think the test 
failed to compile, so I assumed MinGW missed these intrinsics? I'll 
double check.
-- 
Rémi Bernon <rbernon at codeweavers.com>