Call scev_reset_htab when Graphite out-of-SSA has changed something.

2010-07-27  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite-sese-to-poly.c (rewrite_cross_bb_scalar_deps): Returns
	a bool.
	(rewrite_commutative_reductions_out_of_ssa_close_phi): Same.
	(rewrite_commutative_reductions_out_of_ssa_loop): Same.
	(rewrite_cross_bb_scalar_deps_out_of_ssa): Call scev_reset_htab
	when something has been changed.
	(rewrite_commutative_reductions_out_of_ssa): Same.

	* gcc.dg/graphite/id-26.c: New.

From-SVN: r163160

gcc/ChangeLog

 2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* graphite-sese-to-poly.c (rewrite_cross_bb_scalar_deps): Returns
+	a bool.
+	(rewrite_commutative_reductions_out_of_ssa_close_phi): Same.
+	(rewrite_commutative_reductions_out_of_ssa_loop): Same.
+	(rewrite_cross_bb_scalar_deps_out_of_ssa): Call scev_reset_htab
+	when something has been changed.
+	(rewrite_commutative_reductions_out_of_ssa): Same.
+
+2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* graphite-sese-to-poly.c (propagate_expr_outside_region): Also
 	handle the case when def is in the sese region.
 	(rewrite_close_phi_out_of_ssa): Call propagate_expr_outside_region

gcc/ChangeLog.graphite

+2010-07-27  Sebastian Pop  <sebastian.pop@amd.com>
+
+	* graphite-sese-to-poly.c (rewrite_cross_bb_scalar_deps): Returns
+	a bool.
+	(rewrite_commutative_reductions_out_of_ssa_close_phi): Same.
+	(rewrite_commutative_reductions_out_of_ssa_loop): Same.
+	(rewrite_cross_bb_scalar_deps_out_of_ssa): Call scev_reset_htab
+	when something has been changed.
+	(rewrite_commutative_reductions_out_of_ssa): Same.
+
+	* gcc.dg/graphite/id-26.c: New.
+
 2010-07-26  Sebastian Pop  <sebastian.pop@amd.com>
 
 	* graphite-sese-to-poly.c (propagate_expr_outside_region): Also

gcc/graphite-sese-to-poly.c

@@ -2428,9 +2428,10 @@ rewrite_cross_bb_scalar_dependence (tree zero_dim_array, tree def, gimple use_st
 }
 
 /* Rewrite the scalar dependences crossing the boundary of the BB
-   containing STMT with an array.  */
+   containing STMT with an array.  Return true when something has been
+   changed.  */
 
-static void
+static bool
 rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
 {
   gimple stmt = gsi_stmt (*gsi);
@@ -2439,6 +2440,7 @@ rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
   basic_block def_bb;
   tree zero_dim_array = NULL_TREE;
   gimple use_stmt;
+  bool res = false;
 
   switch (gimple_code (stmt))
     {
@@ -2451,27 +2453,29 @@ rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
       break;
 
     default:
-      return;
+      return false;
     }
 
   if (!is_gimple_reg (def))
-    return;
+    return false;
 
   if (scev_analyzable_p (def, region))
     {
       loop_p loop = loop_containing_stmt (SSA_NAME_DEF_STMT (def));
       tree scev = scalar_evolution_in_region (region, loop, def);
 
-      if (tree_does_not_contain_chrecs (scev))
-	propagate_expr_outside_region (def, scev, region);
+      if (tree_contains_chrecs (scev, NULL))
+	return false;
 
-      return;
+      propagate_expr_outside_region (def, scev, region);
+      return true;
     }
 
   def_bb = gimple_bb (stmt);
 
   FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
-    if (gimple_code (use_stmt) == GIMPLE_PHI)
+    if (gimple_code (use_stmt) == GIMPLE_PHI
+	&& (res = true))
       {
 	gimple_stmt_iterator psi = gsi_for_stmt (use_stmt);
 
@@ -2484,7 +2488,8 @@ rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
   FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
     if (gimple_code (use_stmt) != GIMPLE_PHI
 	&& def_bb != gimple_bb (use_stmt)
-	&& !is_gimple_debug (use_stmt))
+	&& !is_gimple_debug (use_stmt)
+	&& (res = true))
       {
 	if (!zero_dim_array)
 	  {
@@ -2497,6 +2502,8 @@ rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
 
 	rewrite_cross_bb_scalar_dependence (zero_dim_array, def, use_stmt);
       }
+
+  return res;
 }
 
 /* Rewrite out of SSA all the reduction phi nodes of SCOP.  */
@@ -2507,16 +2514,21 @@ rewrite_cross_bb_scalar_deps_out_of_ssa (scop_p scop)
   basic_block bb;
   gimple_stmt_iterator psi;
   sese region = SCOP_REGION (scop);
+  bool changed = false;
 
   FOR_EACH_BB (bb)
     if (bb_in_sese_p (bb, region))
       for (psi = gsi_start_bb (bb); !gsi_end_p (psi); gsi_next (&psi))
-	rewrite_cross_bb_scalar_deps (region, &psi);
+	changed |= rewrite_cross_bb_scalar_deps (region, &psi);
 
-  update_ssa (TODO_update_ssa);
+  if (changed)
+    {
+      scev_reset_htab ();
+      update_ssa (TODO_update_ssa);
 #ifdef ENABLE_CHECKING
-  verify_loop_closed_ssa (true);
+      verify_loop_closed_ssa (true);
 #endif
+    }
 }
 
 /* Returns the number of pbbs that are in loops contained in SCOP.  */
@@ -2902,26 +2914,31 @@ translate_scalar_reduction_to_array (VEC (gimple, heap) *in,
     }
 }
 
-/* Rewrites out of SSA a commutative reduction at CLOSE_PHI.  */
+/* Rewrites out of SSA a commutative reduction at CLOSE_PHI.  Returns
+   true when something has been changed.  */
 
-static void
+static bool
 rewrite_commutative_reductions_out_of_ssa_close_phi (gimple close_phi,
 						     sbitmap reductions)
 {
+  bool res;
   VEC (gimple, heap) *in = VEC_alloc (gimple, heap, 10);
   VEC (gimple, heap) *out = VEC_alloc (gimple, heap, 10);
 
   detect_commutative_reduction (close_phi, &in, &out);
-  if (VEC_length (gimple, in) > 0)
+  res = VEC_length (gimple, in) > 0;
+  if (res)
     translate_scalar_reduction_to_array (in, out, reductions);
 
   VEC_free (gimple, heap, in);
   VEC_free (gimple, heap, out);
+  return res;
 }
 
-/* Rewrites all the commutative reductions from LOOP out of SSA.  */
+/* Rewrites all the commutative reductions from LOOP out of SSA.
+   Returns true when something has been changed.  */
 
-static void
+static bool
 rewrite_commutative_reductions_out_of_ssa_loop (loop_p loop,
 						sbitmap reductions,
 						sese region)
@@ -2929,16 +2946,19 @@ rewrite_commutative_reductions_out_of_ssa_loop (loop_p loop,
   gimple_stmt_iterator gsi;
   edge exit = single_exit (loop);
   tree res;
+  bool changed = false;
 
   if (!exit)
-    return;
+    return false;
 
   for (gsi = gsi_start_phis (exit->dest); !gsi_end_p (gsi); gsi_next (&gsi))
     if ((res = gimple_phi_result (gsi_stmt (gsi)))
 	&& is_gimple_reg (res)
 	&& !scev_analyzable_p (res, region))
-      rewrite_commutative_reductions_out_of_ssa_close_phi (gsi_stmt (gsi),
-							   reductions);
+      changed |= rewrite_commutative_reductions_out_of_ssa_close_phi
+	(gsi_stmt (gsi), reductions);
+
+  return changed;
 }
 
 /* Rewrites all the commutative reductions from SCOP out of SSA.  */
@@ -2948,19 +2968,26 @@ rewrite_commutative_reductions_out_of_ssa (sese region, sbitmap reductions)
 {
   loop_iterator li;
   loop_p loop;
+  bool changed = false;
 
   if (!flag_associative_math)
     return;
 
   FOR_EACH_LOOP (li, loop, 0)
     if (loop_in_sese_p (loop, region))
-      rewrite_commutative_reductions_out_of_ssa_loop (loop, reductions, region);
+      changed |= rewrite_commutative_reductions_out_of_ssa_loop (loop,
+								 reductions,
+								 region);
 
-  gsi_commit_edge_inserts ();
-  update_ssa (TODO_update_ssa);
+  if (changed)
+    {
+      scev_reset_htab ();
+      gsi_commit_edge_inserts ();
+      update_ssa (TODO_update_ssa);
 #ifdef ENABLE_CHECKING
-  verify_loop_closed_ssa (true);
+      verify_loop_closed_ssa (true);
 #endif
+    }
 }
 
 /* Java does not initialize long_long_integer_type_node.  */

gcc/testsuite/ChangeLog

 2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* gcc.dg/graphite/id-26.c: New.
+
+2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* gcc.dg/graphite/id-25.c: New.
 
 2010-08-02  Sebastian Pop  <sebastian.pop@amd.com>

gcc/testsuite/gcc.dg/graphite/id-26.c

+int find_sad_16x16(int *intra_mode)
+{
+  int current_intra_sad_2,best_intra_sad2;
+  int M1[16][16],M0[4][4][4][4],M3[4],M4[4][4];
+  int i,j,k;
+  int ii,jj;
+  int up_avail, left_avail, left_up_avail;
+  for (i=0;i<17;i++)
+    if (left_up_avail)
+      {
+	for (jj=0;jj<4;jj++)
+	  for (ii=0;ii<4;ii++)
+	    for (j=0;j<4;j++)
+	      for (i=0;i<4;i++)
+		{
+		  M0[i][ii][2][jj]=M3[0]-M3[1];
+		  M0[i][ii][1][jj]=M3[2]+M3[3];
+		  current_intra_sad_2 += abs(M0[i][ii][j][jj]);
+		}
+
+        if(current_intra_sad_2 < best_intra_sad2)
+          best_intra_sad2=current_intra_sad_2;
+      }
+}