Resetting the Dynamic Profile Counters
_PGOPTI_Prof_Reset()function resets the dynamic profile counters. The prototype of the function call is listed below.
This function is now deprecated. See _PGOPTI_Prof_Reset_All() function, which can be used instead.
One of the activities performed under profile-guided optimization is value-profiling. With value-profiling, the compiler inserts instrumentation to obtain a sample of the variable values in the program. Based upon this sampling, the compiler optimizes the user's code using frequently observed values.
In effect, during a run of an instrumented executable, the segment maintained for each routine executed during that run stores the following information:
- Number of times each basic block in the routine is executed
- Specific values observed at each data point undergoing value-profiling
- Number of times each of these values are observed
_PGOPTI_Prof_Reset()function is called, the basic block execution count for each basic block is set to 0, and the value-profiling information is reset to indicate that no values were observed at any data point.
Use this function to clear the profile counters prior to collecting profile information on a section of the instrumented application. See the example under Dumping Profile Information.