On Mon, 17 Sep 2001, Dave Jones wrote:
> On Mon, 17 Sep 2001, Jean-Marc Saffroy wrote:
> > What is the intent behind this "rep;nop" ? Does it really rely on an
> > undocumented behaviour ?
> Its used to stop Pentium 4's from cooking themselves.
> See the P4 manuals for more info.
Ok, I found it: actually it is the PAUSE opcode in the P4 instruction set,
and the doc for PAUSE mentions that it is equivalent to a NOP on older
So no black magic here, except that "rep;nop" is a bit misleading, since
the Intel docs for REP and NOP do not mention PAUSE...
Thanks all for you help.
-- Jean-Marc Saffroy - Research Engineer - Silicomp Research Institute mailto:email@example.com
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This archive was generated by hypermail 2b29 : Sun Sep 23 2001 - 21:00:20 EST