[Bug tree-optimization/42438] New: Fix for PR38819 is too conservative

[rguenth at gcc dot gnu dot org]

See PR42108.  Basically we still can PRE a possibly trapping division in

  if (b)
    tmp = a/b;
  tmp = a/b;

because there is no invisible exit along the paths to the insertion point.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42108#c41

hints at what we should instead do.


-- 
           Summary: Fix for PR38819 is too conservative
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42438