[Bug tree-optimization/36204] New: [4.4 Regression] missed store sinking out of a loop

[pinskia at gcc dot gnu dot org]

At first I thought this was not a generic issue but I noticed it in generic
places that did not have any aliasing issues.
An example is the following program should not have any loop in it:
 struct BUF1
{
  int b1;
  int b12;
};

void link_error();


int foo(int n, int * p)
{

    int i = 0;
    for (i = 0; i < 1024*1024; i++)
    {
        p[0] = 1;
    }
    if (p[0] != 1)
      link_error ();
    return 0;
}

GNU C (GCC) version 4.4.0 20080304 (experimental) [trunk revision 132852]
(i386-apple-darwin8.10.1)

Worked but:
GNU C (GCC) version 4.4.0 20080510 (experimental) [trunk revision 135142]
(i386-apple-darwin8.11.1)

does not.


-- 
           Summary: [4.4 Regression] missed store sinking out of a loop
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36204