[Bug tree-optimization/32553] New: missed optimization to eliminate duplicate expressions

["zippel at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

In this example:

int g(void);

void f(int *p, int i)
{
        p[i] = g();
        p[i + 2] = g();
        p[i + 10] = g();
        p[i + 100] = g();
}

the common expression of (p + i * 4) isn't completely eliminated.
It works with the current stable Debian release (gcc (GCC) 4.1.2 20061115), but
anything later misses this opportunity.


-- 
           Summary: missed optimization to eliminate duplicate expressions
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zippel at gcc dot gnu dot org
  GCC host triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32553