re PR tree-optimization/41750 (IPA-SRA is broken)

2009-11-02  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/41750
	* tree-sra.c (analyze_modified_params): Loop over all
	representatives of components of a parameter.

	* testsuite/gcc.c-torture/execute/pr41750.c: New test.

From-SVN: r153809

1 files changed, 31 insertions, 25 deletions

diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c
index 8db84ea..12b1990 100644
--- a/gcc/tree-sra.c
+++ b/gcc/tree-sra.c
@@ -2818,33 +2818,39 @@ analyze_modified_params (VEC (access_p, heap) *representatives)
 
   for (i = 0; i < func_param_count; i++)
     {
-      struct access *repr = VEC_index (access_p, representatives, i);
-      VEC (access_p, heap) *access_vec;
-      int j, access_count;
-      tree parm;
-
-      if (!repr || no_accesses_p (repr))
-	continue;
-      parm = repr->base;
-      if (!POINTER_TYPE_P (TREE_TYPE (parm))
-	  || repr->grp_maybe_modified)
-	continue;
+      struct access *repr;
 
-      access_vec = get_base_access_vector (parm);
-      access_count = VEC_length (access_p, access_vec);
-      for (j = 0; j < access_count; j++)
+      for (repr = VEC_index (access_p, representatives, i);
+	   repr;
+	   repr = repr->next_grp)
 	{
-	  struct access *access;
-	  ao_ref ar;
-
-	  /* All accesses are read ones, otherwise grp_maybe_modified would be
-	     trivially set.  */
-	  access = VEC_index (access_p, access_vec, j);
-	  ao_ref_init (&ar, access->expr);
-	  walk_aliased_vdefs (&ar, gimple_vuse (access->stmt),
-			      mark_maybe_modified, repr, NULL);
-	  if (repr->grp_maybe_modified)
-	    break;
+	  VEC (access_p, heap) *access_vec;
+	  int j, access_count;
+	  tree parm;
+
+	  if (no_accesses_p (repr))
+	    continue;
+	  parm = repr->base;
+	  if (!POINTER_TYPE_P (TREE_TYPE (parm))
+	      || repr->grp_maybe_modified)
+	    continue;
+
+	  access_vec = get_base_access_vector (parm);
+	  access_count = VEC_length (access_p, access_vec);
+	  for (j = 0; j < access_count; j++)
+	    {
+	      struct access *access;
+	      ao_ref ar;
+
+	      /* All accesses are read ones, otherwise grp_maybe_modified would
+		 be trivially set.  */
+	      access = VEC_index (access_p, access_vec, j);
+	      ao_ref_init (&ar, access->expr);
+	      walk_aliased_vdefs (&ar, gimple_vuse (access->stmt),
+				  mark_maybe_modified, repr, NULL);
+	      if (repr->grp_maybe_modified)
+		break;
+	    }
 	}
     }
 }