Re: [Valgrind-users] Dirty helper called more times than expected

[Josef W. <Jos...@gm...>]

Am 04.10.2013 21:47, schrieb Sonny Tavernier:
> Hi, 
> 
> I have an unexpected behavior with a basic tool. 
> For each Put statement of a basic block, I register a dirty helper using
> unsafeIRDirty_0_N. 
> The problem is that the dirty helper is called more times than expected, 
> e.g. there are 5 Put statements in a basic block but the dirty helper is
> called 13 times.

You seem to confuse instrumentation vs. execution time.

As you set the counters to zero only at instrumentation time, of course
they will diverge when a BB is executed a second time (as every BB is
instrumented only once).

Further, Valgrind works on super blocks (SBs), not just BBs.
A SB may have multiple side exits. Thus, counters may be
different whenever the execution flow exits an SB early.

Josef