[Bug tree-optimization/34172] New: Missed store ccp optimization

[eres at il dot ibm dot com]

#define N 256

struct
{
  int x;
  int y;
} S[100];

int z[100];

int
foo (int y)
{
  int x;

  S[5].x = 4;
  S[5].y = 0;

  x = S[5].x;

  return (x);
}

On powerpc64-linux, r130275 with -O2 we get:
(taken from .store_ccp dump file)

foo (y)
{
  int x;

<bb 2>:
  S[5].x = 4;
  S[5].y = 0;
  x_1 = S[5].x;
  return x_1;

}

[A patch was submitted
(http://gcc.gnu.org/ml/gcc-patches/2007-06/msg01901.html) which is no longer
relevant because of -http://gcc.gnu.org/ml/gcc-patches/2007-08/msg01370.html.]


-- 
           Summary: Missed store ccp optimization
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: eres at il dot ibm dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34172