On Wed, May 11, 2011 at 10:03 PM, Ian Lance Taylor <i...@google.com> wrote: > Pierre Vittet <pier...@pvittet.com> writes: > >> First, thanks for your help. I have looked at several function using >> calculate_dominance_info(). From what I understand, when you have >> finish to use it, you have to clear the structure by making a >> free_dominance_info(). >> In the function flow_loops_find (file gcc/cfgloop.c), there is a call >> to calculate_dominance_info() without call to free_dominance_info(). I >> feel it is a bug, no? > > Not in this case, no. The caller or a later pass is responsible for > freeing it in this case. There should ideally be a comment about this.
dominator information should be freed if it is made invalid by CFG transformations. Otherwise the policy is to keep it around to avoid re-computing it (too many passes need it). For post-dominator info the policy is to always free it. Richard. > Ian >
