[Bug tree-optimization/23133] New: recip does not factor division by function parameter

[rguenth at gcc dot gnu dot org]

The following testcase, compiled with -O2 -ffast-math should have
1/d factored out, but doesn't, because d is a function parameter
and recip walks SSA_NAME defs, and d does not have one.

double a, b;
int x;
double foo(double d)
{
  if (x)
     a/=d;
  return a/d + b/d;
}

-- 
           Summary: recip does not factor division by function parameter
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23133