[PATCH 5/6] include: Add __rdtsc and __rdtscp intrinsics.
Jacek Caban
jacek at codeweavers.com
Wed Mar 10 08:57:15 CST 2021
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
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