Re: [Valgrind-users] cpu cycles

[Joerg B. <jo...@we...>]

Vincent Penquerc'h wrote:
>>OK, so an implementation to do cycle counting needs to have
>>a table that lists for every instruction how many cycles it
>>need for the different cache-hit/miss situations.
>>
>>Are these informations available (for all the processors)?
> 
> 
> Yes, but there is an awful lot of possible combinations. That

what are the conditions? Is it this or more?
* L1 Hit, L2 hit, Cache Miss
* branch prediction was true, false

and this all per instruction, per processor.

> would be nifty to try out a piece of time critical code on
> various architectures to see how it fares, since one would
> usually optimize for one's dev machine...
> 
I thought that the assumptions "all instructions will
take the same amount of time", but you tould me that
this is to easy :-)

	Joerg