Gedare Bloom started a new discussion on cpukit/dhrl/dhrl.c: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150838

 > +  /* Set fallback iterations if caller left the configuration at 0 */
 > +  iterations = ctx->active_config.calibration_iterations;
 > +  if ( iterations == 0 ) {
 > +    iterations = 5000;
 > +  }
 > +
 > +  best_bit = 6;
 > +  lowest_latency = UINT64_MAX;
 > +  max_safe_bit = 0;
 > +  safe_size = ctx->active_config.memory_region_size / 2;
 > +
 > +  if ( safe_size > 1 ) {
 > +    max_safe_bit = (uint8_t) ( ( sizeof( unsigned long long ) * 8 - 1 ) -
 > +                               __builtin_clzll(
 > +                                 (unsigned long long) safe_size
 > +                               ) );

a function call to wrap this might help, the logic is a bit complex for a 
single compound expression.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150838
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