Sent from my iPhone On Jan 16, 2009, at 9:23 AM, "H.J. Lu" <hjl.to...@gmail.com> wrote:
Hi, I am trying to implement unsigned long long __rdtsc (void); for RDTSC as an intrinsic. It is easy to do it with asm statement. But I am having a hard time to implement it as a gcc builtin. The main problem is there is no input. It is impossible to write a proper RTL for it. Any suggestions?
unspec_volatile? I don't see any issues with a no input unspec_volatile the rs6000 backend uses that already.
Thanks, Andrew Pinski
I am thinking about adding some fake readonly registers. Will it work? Thanks. -- H.J.
