Delay base decl's alignment adjustment until transformation happens

From-SVN: r202229

gcc/ChangeLog

+2013-08-29  Xinliang David Li  <davidxl@google.com>
+
+	* tree-vect-slp.c (destroy_bb_vec_info): Data ref cleanup.
+	* tree-vect-loop.c (destroy_bb_vec_info): Ditto.
+	* tree-vect-data-refs.c (vect_compute_data_ref_alignment):
+	Delay base decl alignment adjustment.
+	* tree-vectorizer.c (vect_destroy_datarefs): New function.
+	* tree-vectorizer.h: New data structure.
+	(set_dr_misalignment): New function.
+	(dr_misalignment): Ditto.
+	* tree-vect-stmts.c (vectorizable_store): Ensure alignment.
+	(vectorizable_load): Ditto.
+	(ensure_base_align): New function.
+	(vectorize_loops): Add dbg_cnt support.
+	(execute_vect_slp): Ditto.
+	* dbgcnt.def: New debug counter.
+	* Makefile: New dependency.
+
 2013-09-03  Meador Inge  <meadori@codesourcery.com>
 
 	Revert:

gcc/Makefile.in

@@ -2656,7 +2656,7 @@ tree-vect-data-refs.o: tree-vect-data-refs.c $(CONFIG_H) $(SYSTEM_H) \
 tree-vectorizer.o: tree-vectorizer.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
    $(DUMPFILE_H) $(TM_H) $(GGC_H) $(TREE_H) $(TREE_FLOW_H) \
    $(CFGLOOP_H) $(TREE_PASS_H) $(TREE_VECTORIZER_H) \
-   $(TREE_PRETTY_PRINT_H)
+   $(TREE_PRETTY_PRINT_H) $(DBGCNT_H)
 vtable-verify.o: vtable-verify.c vtable-verify.h $(CONFIG_H) \
    $(SYSTEM_H) coretypes.h $(TM_H) $(TREE_H) cp/cp-tree.h $(TM_P_H) \
    $(BASIC_BLOCK_H) output.h $(TREE_FLOW_H) $(TREE_DUMP_H) $(TREE_PASS_H) \

gcc/dbgcnt.def

@@ -172,6 +172,8 @@ DEBUG_COUNTER (pre_insn)
 DEBUG_COUNTER (treepre_insert)
 DEBUG_COUNTER (tree_sra)
 DEBUG_COUNTER (eipa_sra)
+DEBUG_COUNTER (vect_loop)
+DEBUG_COUNTER (vect_slp)
 DEBUG_COUNTER (sched2_func)
 DEBUG_COUNTER (sched_block)
 DEBUG_COUNTER (sched_func)

gcc/tree-vect-data-refs.c

@@ -763,15 +763,11 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
           dump_generic_expr (MSG_NOTE, TDF_SLIM, ref);
         }
 
-      DECL_ALIGN (base) = TYPE_ALIGN (vectype);
-      DECL_USER_ALIGN (base) = 1;
+      gcc_assert (dr->aux);
+      ((dataref_aux *)dr->aux)->base_decl = base;
+      ((dataref_aux *)dr->aux)->base_misaligned = true;
     }
 
-  /* At this point we assume that the base is aligned.  */
-  gcc_assert (base_aligned
-	      || (TREE_CODE (base) == VAR_DECL
-		  && DECL_ALIGN (base) >= TYPE_ALIGN (vectype)));
-
   /* If this is a backward running DR then first access in the larger
      vectype actually is N-1 elements before the address in the DR.
      Adjust misalign accordingly.  */

gcc/tree-vect-loop.c

@@ -957,7 +957,7 @@ destroy_loop_vec_info (loop_vec_info loop_vinfo, bool clean_stmts)
     }
 
   free (LOOP_VINFO_BBS (loop_vinfo));
-  free_data_refs (LOOP_VINFO_DATAREFS (loop_vinfo));
+  vect_destroy_datarefs (loop_vinfo, NULL);
   free_dependence_relations (LOOP_VINFO_DDRS (loop_vinfo));
   LOOP_VINFO_LOOP_NEST (loop_vinfo).release ();
   LOOP_VINFO_MAY_MISALIGN_STMTS (loop_vinfo).release ();

gcc/tree-vect-slp.c

@@ -1825,7 +1825,7 @@ destroy_bb_vec_info (bb_vec_info bb_vinfo)
         free_stmt_vec_info (stmt);
     }
 
-  free_data_refs (BB_VINFO_DATAREFS (bb_vinfo));
+  vect_destroy_datarefs (NULL, bb_vinfo);
   free_dependence_relations (BB_VINFO_DDRS (bb_vinfo));
   BB_VINFO_GROUPED_STORES (bb_vinfo).release ();
   slp_instances = BB_VINFO_SLP_INSTANCES (bb_vinfo);

gcc/tree-vect-stmts.c

@@ -3809,6 +3809,26 @@ vectorizable_operation (gimple stmt, gimple_stmt_iterator *gsi,
   return true;
 }
 
+/* A helper function to ensure data reference DR's base alignment
+   for STMT_INFO.  */
+
+static void
+ensure_base_align (stmt_vec_info stmt_info, struct data_reference *dr)
+{
+  if (!dr->aux)
+    return;
+
+  if (((dataref_aux *)dr->aux)->base_misaligned)
+    {
+      tree vectype = STMT_VINFO_VECTYPE (stmt_info);
+      tree base_decl = ((dataref_aux *)dr->aux)->base_decl;
+
+      DECL_ALIGN (base_decl) = TYPE_ALIGN (vectype);
+      DECL_USER_ALIGN (base_decl) = 1;
+      ((dataref_aux *)dr->aux)->base_misaligned = false;
+    }
+}
+
 
 /* Function vectorizable_store.
 
@@ -3820,7 +3840,7 @@ vectorizable_operation (gimple stmt, gimple_stmt_iterator *gsi,
 
 static bool
 vectorizable_store (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
-		    slp_tree slp_node)
+                    slp_tree slp_node)
 {
   tree scalar_dest;
   tree data_ref;
@@ -3982,6 +4002,8 @@ vectorizable_store (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
 
   /** Transform.  **/
 
+  ensure_base_align (stmt_info, dr);
+
   if (grouped_store)
     {
       first_dr = STMT_VINFO_DATA_REF (vinfo_for_stmt (first_stmt));
@@ -4364,7 +4386,7 @@ permute_vec_elements (tree x, tree y, tree mask_vec, gimple stmt,
 
 static bool
 vectorizable_load (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
-		   slp_tree slp_node, slp_instance slp_node_instance)
+                   slp_tree slp_node, slp_instance slp_node_instance)
 {
   tree scalar_dest;
   tree vec_dest = NULL;
@@ -4375,7 +4397,7 @@ vectorizable_load (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
   struct loop *loop = NULL;
   struct loop *containing_loop = (gimple_bb (stmt))->loop_father;
   bool nested_in_vect_loop = false;
-  struct data_reference *dr = STMT_VINFO_DATA_REF (stmt_info), *first_dr;
+  struct data_reference *dr = STMT_VINFO_DATA_REF (stmt_info), *first_dr = NULL;
   tree vectype = STMT_VINFO_VECTYPE (stmt_info);
   tree elem_type;
   tree new_temp;
@@ -4575,6 +4597,8 @@ vectorizable_load (gimple stmt, gimple_stmt_iterator *gsi, gimple *vec_stmt,
 
   /** Transform.  **/
 
+  ensure_base_align (stmt_info, dr);
+
   if (STMT_VINFO_GATHER_P (stmt_info))
     {
       tree vec_oprnd0 = NULL_TREE, op;

gcc/tree-vectorizer.c

@@ -68,6 +68,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-pass.h"
 #include "hash-table.h"
 #include "tree-ssa-propagate.h"
+#include "dbgcnt.h"
 
 /* Loop or bb location.  */
 LOC vect_location;
@@ -279,6 +280,31 @@ note_simd_array_uses (hash_table <simd_array_to_simduid> *htab)
       }
 }
 
+/* A helper function to free data refs.  */
+
+void
+vect_destroy_datarefs (loop_vec_info loop_vinfo, bb_vec_info bb_vinfo)
+{
+  vec<data_reference_p> datarefs;
+  struct data_reference *dr;
+  unsigned int i;
+
+ if (loop_vinfo)
+    datarefs = LOOP_VINFO_DATAREFS (loop_vinfo);
+  else
+    datarefs = BB_VINFO_DATAREFS (bb_vinfo);
+
+  FOR_EACH_VEC_ELT (datarefs, i, dr)
+    if (dr->aux)
+      {
+        free (dr->aux);
+        dr->aux = NULL;
+      }
+
+  free_data_refs (datarefs);
+}
+
+
 /* Function vectorize_loops.
 
    Entry point to loop vectorization phase.  */
@@ -331,6 +357,9 @@ vectorize_loops (void)
 	if (!loop_vinfo || !LOOP_VINFO_VECTORIZABLE_P (loop_vinfo))
 	  continue;
 
+        if (!dbg_cnt (vect_loop))
+	  break;
+
         if (LOCATION_LOCUS (vect_location) != UNKNOWN_LOC
 	    && dump_enabled_p ())
           dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,
@@ -440,6 +469,9 @@ execute_vect_slp (void)
 
       if (vect_slp_analyze_bb (bb))
         {
+          if (!dbg_cnt (vect_slp))
+            break;
+
           vect_slp_transform_bb (bb);
           if (dump_enabled_p ())
             dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, vect_location,

gcc/tree-vectorizer.h

@@ -629,6 +629,12 @@ typedef struct _stmt_vec_info {
 #define PURE_SLP_STMT(S)                  ((S)->slp_type == pure_slp)
 #define STMT_SLP_TYPE(S)                   (S)->slp_type
 
+struct dataref_aux {
+  tree base_decl;
+  bool base_misaligned;
+  int misalignment;
+};
+
 #define VECT_MAX_COST 1000
 
 /* The maximum number of intermediate steps required in multi-step type
@@ -831,11 +837,31 @@ destroy_cost_data (void *data)
 /*-----------------------------------------------------------------*/
 /* Info on data references alignment.                              */
 /*-----------------------------------------------------------------*/
+inline void
+set_dr_misalignment (struct data_reference *dr, int val)
+{
+  dataref_aux *data_aux = (dataref_aux *) dr->aux;
+
+  if (!data_aux)
+    {
+      data_aux = XCNEW (dataref_aux);
+      dr->aux = data_aux;
+    }
+
+  data_aux->misalignment = val;
+}
+
+inline int
+dr_misalignment (struct data_reference *dr)
+{
+  gcc_assert (dr->aux);
+  return ((dataref_aux *) dr->aux)->misalignment;
+}
 
 /* Reflects actual alignment of first access in the vectorized loop,
    taking into account peeling/versioning if applied.  */
-#define DR_MISALIGNMENT(DR)   ((int) (size_t) (DR)->aux)
-#define SET_DR_MISALIGNMENT(DR, VAL)   ((DR)->aux = (void *) (size_t) (VAL))
+#define DR_MISALIGNMENT(DR) dr_misalignment (DR)
+#define SET_DR_MISALIGNMENT(DR, VAL) set_dr_misalignment (DR, VAL)
 
 /* Return TRUE if the data access is aligned, and FALSE otherwise.  */
 
@@ -1014,5 +1040,6 @@ void vect_pattern_recog (loop_vec_info, bb_vec_info);
 
 /* In tree-vectorizer.c.  */
 unsigned vectorize_loops (void);
+void vect_destroy_datarefs (loop_vec_info, bb_vec_info);
 
 #endif  /* GCC_TREE_VECTORIZER_H  */