[Bug tree-optimization/50730] SLP vectorization confused by unrelated DRs

["irar at il dot ibm.com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50730

Ira Rosen <irar at il dot ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-10-16
                 CC|                            |irar at il dot ibm.com
     Ever Confirmed|0                           |1

--- Comment #1 from Ira Rosen <irar at il dot ibm.com> 2011-10-16 09:41:27 UTC ---
Tested only with the vectorizer tests.

Index: tree-vect-data-refs.c
===================================================================
--- tree-vect-data-refs.c       (revision 179789)
+++ tree-vect-data-refs.c       (working copy)
@@ -2524,7 +2524,7 @@ vect_analyze_data_refs (loop_vec_info lo
   VEC (data_reference_p, heap) *datarefs;
   struct data_reference *dr;
   tree scalar_type;
-  bool res;
+  bool res, stop_bb_analysis = false;

   if (vect_print_dump_info (REPORT_DETAILS))
     fprintf (vect_dump, "=== vect_analyze_data_refs ===\n");
@@ -2579,12 +2579,19 @@ vect_analyze_data_refs (loop_vec_info lo
         {
           if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS))
            fprintf (vect_dump, "not vectorized: unhandled data-ref ");
+
           return false;
         }

       stmt = DR_STMT (dr);
       stmt_info = vinfo_for_stmt (stmt);

+      if (stop_bb_analysis)
+        {
+          STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+          continue;
+        }
+
       /* Check that analysis of the data-ref succeeded.  */
       if (!DR_BASE_ADDRESS (dr) || !DR_OFFSET (dr) || !DR_INIT (dr)
           || !DR_STEP (dr))
@@ -2595,6 +2602,13 @@ vect_analyze_data_refs (loop_vec_info lo
               print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
             }

+          if (bb_vinfo)
+            {
+              STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
+              continue;
+            }
+
           return false;
         }

@@ -2603,7 +2617,15 @@ vect_analyze_data_refs (loop_vec_info lo
           if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS))
             fprintf (vect_dump, "not vectorized: base addr of dr is a "
                      "constant");
-          return false;
+
+          if (bb_vinfo)
+            {
+              STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
+              continue;
+            }
+
+           return false;
         }

       if (TREE_THIS_VOLATILE (DR_REF (dr)))
@@ -2613,6 +2635,14 @@ vect_analyze_data_refs (loop_vec_info lo
               fprintf (vect_dump, "not vectorized: volatile type ");
               print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
             }
+
+          if (bb_vinfo)
+            {
+              STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
+              continue;
+            }
+
           return false;
         }

@@ -2628,6 +2658,14 @@ vect_analyze_data_refs (loop_vec_info lo
                        "exception ");
               print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
             }
+
+          if (bb_vinfo)
+            {
+              STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
+              continue;
+            }
+
           return false;
         }

@@ -2745,6 +2783,14 @@ vect_analyze_data_refs (loop_vec_info lo
                        "not vectorized: more than one data ref in stmt: ");
               print_gimple_stmt (vect_dump, stmt, 0, TDF_SLIM);
             }
+
+          if (bb_vinfo)
+            {
+              STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
+              continue;
+            }
+
           return false;
         }

@@ -2769,6 +2815,7 @@ vect_analyze_data_refs (loop_vec_info lo
             {
               /* Mark the statement as not vectorizable.  */
               STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+              stop_bb_analysis = true;
               continue;
             }
           else