Re: [patch] __volatile__ needed in get_cycles()?
Richard Henderson (rth@twiddle.net)
Sat, 27 Mar 1999 19:40:17 -0800
On Sat, Mar 27, 1999 at 12:44:22PM +0000, Tigran Aivazian wrote:
> x = get_cycles();
> __asm__("cpuid");
> y = get_cycles();
[...]
> - __asm__("rdtsc":"=a" (eax), "=d" (edx));
> + __asm__ __volatile__ ("rdtsc":"=a" (eax), "=d" (edx));
Yes, volatile is needed to keep the asm from being moved "too far".
r~
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