intel performance register

Entry #1293, Wed, July 10, 2002, 13:32 EST (Coding, Hacking, & CS stuff)
(posted when I was 23 years old.)
I gots to record this here, because every time I want to use it, I have to do a recursive grep through my entire cse directory tree to remember when I used it before and how I used it.

To access the intel performance register that stores the number of cycles executed so far:

  unsigned long long foo;
  __asm__ volatile (".byte 0x0f, 0x31" : "=A" (foo));

Perhaps there's a better way.
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