Patchwork [graphite] Remove sese_adjust_liveout_phis

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Submitter Sebastian Pop
Date June 12, 2010, 7:53 a.m.
Message ID <AANLkTink94yQ-xUGo7bVKd0Tsw_QmPmE--3J82GLkSPV@mail.gmail.com>
Download mbox | patch
Permalink /patch/55381/
State New
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Comments

Sebastian Pop - June 12, 2010, 7:53 a.m.
Hi,

with the attached patches we no longer need to use the rename_map to
substitute the arguments of the phi nodes created after the code
generated by Graphite.  I committed these patches to the graphite
branch, and I will commit them to trunk once they pass the usual
graphite branch tests.

The aim is to replace the rename_map with the map that CLooG exposes
for each user statement: associating to a loop level an expression.
The expand_* functions will be replaced by the code generation from a
chrec that is obtained from the original scev by chrec_applying the
loop level -> expression map on each varying loop.  This will then
allow us to remove the call to the IV canonicalization from Graphite.

Sebastian

Patch

From e1e77ccc827024af17e5afc9baf5d8f044815052 Mon Sep 17 00:00:00 2001
From: Sebastian Pop <sebpop@gmail.com>
Date: Fri, 11 Jun 2010 19:58:39 -0500
Subject: [PATCH 4/4] Also rewrite out of SSA scalar dependences going outside the SCoP region.

2010-06-12  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite-clast-to-gimple.c (gloog): Remove call to
	sese_adjust_liveout_phis.
	* graphite-sese-to-poly.c (scev_analyzable_p): When scev returns an
	SSA_NAME, allow it to be handled by rewrite_cross_bb_scalar_deps.
	(rewrite_cross_bb_scalar_deps): Handle GIMPLE_PHI nodes: call
	rewrite_phi_out_of_ssa.
	* sese.c (get_vdef_before_sese): Removed.
	(sese_adjust_vphi): Removed.
	(sese_adjust_liveout_phis): Removed.
	* sese.h (sese_adjust_liveout_phis): Removed.
---
 gcc/ChangeLog.graphite         |   13 +++
 gcc/graphite-clast-to-gimple.c |    4 -
 gcc/graphite-sese-to-poly.c    |   13 ++-
 gcc/sese.c                     |  159 ----------------------------------------
 gcc/sese.h                     |    1 -
 5 files changed, 22 insertions(+), 168 deletions(-)

diff --git a/gcc/ChangeLog.graphite b/gcc/ChangeLog.graphite
index 888a77d..d703048 100644
--- a/gcc/ChangeLog.graphite
+++ b/gcc/ChangeLog.graphite
@@ -1,5 +1,18 @@ 
 2010-06-12  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* graphite-clast-to-gimple.c (gloog): Remove call to
+	sese_adjust_liveout_phis.
+	* graphite-sese-to-poly.c (scev_analyzable_p): When scev returns an
+	SSA_NAME, allow it to be handled by rewrite_cross_bb_scalar_deps.
+	(rewrite_cross_bb_scalar_deps): Handle GIMPLE_PHI nodes: call
+	rewrite_phi_out_of_ssa.
+	* sese.c (get_vdef_before_sese): Removed.
+	(sese_adjust_vphi): Removed.
+	(sese_adjust_liveout_phis): Removed.
+	* sese.h (sese_adjust_liveout_phis): Removed.
+
+2010-06-12  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* graphite-sese-to-poly.c (insert_out_of_ssa_copy): Pass an extra
 	argument for the place after which to insert the out of SSA copy.
 	(rewrite_close_phi_out_of_ssa): Update calls to insert_out_of_ssa_copy.
diff --git a/gcc/graphite-clast-to-gimple.c b/gcc/graphite-clast-to-gimple.c
index a363f5d..01adba0 100644
--- a/gcc/graphite-clast-to-gimple.c
+++ b/gcc/graphite-clast-to-gimple.c
@@ -1578,10 +1578,6 @@  gloog (scop_p scop, VEC (scop_p, heap) *scops, htab_t bb_pbb_mapping)
 		   rename_map, &newivs, newivs_index,
 		   bb_pbb_mapping, 1, params_index);
   graphite_verify ();
-  sese_adjust_liveout_phis (region, rename_map,
-			    if_region->region->exit->src,
-			    if_region->false_region->exit,
-			    if_region->true_region->exit);
   scev_reset_htab ();
   rename_nb_iterations (rename_map);
 
diff --git a/gcc/graphite-sese-to-poly.c b/gcc/graphite-sese-to-poly.c
index 7bb7bb8..57967e5 100644
--- a/gcc/graphite-sese-to-poly.c
+++ b/gcc/graphite-sese-to-poly.c
@@ -2325,7 +2325,8 @@  scev_analyzable_p (tree def, sese region)
   loop_p loop = loop_containing_stmt (stmt);
   tree scev = scalar_evolution_in_region (region, loop, def);
 
-  return !chrec_contains_undetermined (scev);
+  return !chrec_contains_undetermined (scev)
+    && TREE_CODE (scev) != SSA_NAME;
 }
 
 /* Rewrite the scalar dependence of DEF used in USE_STMT with a memory
@@ -2379,9 +2380,13 @@  rewrite_cross_bb_scalar_deps (sese region, gimple_stmt_iterator *gsi)
   def_bb = gimple_bb (stmt);
 
   FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, def)
-    if (def_bb != gimple_bb (use_stmt)
-	&& gimple_code (use_stmt) != GIMPLE_PHI
-	&& !is_gimple_debug (use_stmt))
+    if (gimple_code (use_stmt) == GIMPLE_PHI)
+      {
+	gimple_stmt_iterator si = gsi_for_stmt (use_stmt);
+	rewrite_phi_out_of_ssa (&si);
+      }
+    else if (def_bb != gimple_bb (use_stmt)
+	     && !is_gimple_debug (use_stmt))
       {
 	if (!zero_dim_array)
 	  {
diff --git a/gcc/sese.c b/gcc/sese.c
index 7e9bd91..051599e 100644
--- a/gcc/sese.c
+++ b/gcc/sese.c
@@ -394,100 +394,6 @@  sese_insert_phis_for_liveouts (sese region, basic_block bb,
   update_ssa (TODO_update_ssa);
 }
 
-/* Get the definition of NAME before the SESE.  Keep track of the
-   basic blocks that have been VISITED in a bitmap.  */
-
-static tree
-get_vdef_before_sese (sese region, tree name, sbitmap visited)
-{
-  unsigned i;
-  gimple stmt = SSA_NAME_DEF_STMT (name);
-  basic_block def_bb = gimple_bb (stmt);
-
-  if (!def_bb || !bb_in_sese_p (def_bb, region))
-    return name;
-
-  if (TEST_BIT (visited, def_bb->index))
-    return NULL_TREE;
-
-  SET_BIT (visited, def_bb->index);
-
-  switch (gimple_code (stmt))
-    {
-    case GIMPLE_PHI:
-      for (i = 0; i < gimple_phi_num_args (stmt); i++)
-	{
-	  tree arg = gimple_phi_arg_def (stmt, i);
-	  tree res;
-
-	  if (gimple_bb (SSA_NAME_DEF_STMT (arg))
-	      && def_bb->index == gimple_bb (SSA_NAME_DEF_STMT (arg))->index)
-	    continue;
-
-	  res = get_vdef_before_sese (region, arg, visited);
-	  if (res)
-	    return res;
-	}
-      return NULL_TREE;
-
-    case GIMPLE_ASSIGN:
-    case GIMPLE_CALL:
-      {
-	use_operand_p use_p = gimple_vuse_op (stmt);
-	tree use = USE_FROM_PTR (use_p);
-
-	if (def_bb->index == gimple_bb (SSA_NAME_DEF_STMT (use))->index)
-	  RESET_BIT (visited, def_bb->index);
-
-	return get_vdef_before_sese (region, use, visited);
-      }
-
-    default:
-      return NULL_TREE;
-    }
-}
-
-/* Adjust a virtual phi node PHI that is placed at the end of the
-   generated code for SCOP:
-
-   | if (1)
-   |   generated code from REGION;
-   | else
-   |   REGION;
-
-   The FALSE_E edge comes from the original code, TRUE_E edge comes
-   from the code generated for the SCOP.  */
-
-static void
-sese_adjust_vphi (sese region, gimple phi, edge true_e)
-{
-  unsigned i;
-
-  gcc_assert (gimple_phi_num_args (phi) == 2);
-
-  for (i = 0; i < gimple_phi_num_args (phi); i++)
-    if (gimple_phi_arg_edge (phi, i) == true_e)
-      {
-	tree true_arg, false_arg, before_scop_arg;
-	sbitmap visited;
-
-	true_arg = gimple_phi_arg_def (phi, i);
-	if (!SSA_NAME_IS_DEFAULT_DEF (true_arg))
-	  return;
-
-	false_arg = gimple_phi_arg_def (phi, i == 0 ? 1 : 0);
-	if (SSA_NAME_IS_DEFAULT_DEF (false_arg))
-	  return;
-
-	visited = sbitmap_alloc (last_basic_block);
-	sbitmap_zero (visited);
-	before_scop_arg = get_vdef_before_sese (region, false_arg, visited);
-	gcc_assert (before_scop_arg != NULL_TREE);
-	SET_PHI_ARG_DEF (phi, i, before_scop_arg);
-	sbitmap_free (visited);
-      }
-}
-
 /* Returns the expression associated to OLD_NAME in MAP.  */
 
 static tree
@@ -585,71 +491,6 @@  rename_sese_parameters (htab_t rename_map, sese region)
 		 rename_variables_in_expr (rename_map, p));
 }
 
-/* Adjusts the phi nodes in the block BB for variables defined in
-   SCOP_REGION and used outside the SCOP_REGION.  The code generation
-   moves SCOP_REGION in the else clause of an "if (1)" and generates
-   code in the then clause:
-
-   | if (1)
-   |   generated code from REGION;
-   | else
-   |   REGION;
-
-   To adjust the phi nodes after the condition, the RENAME_MAP is
-   used.  */
-
-void
-sese_adjust_liveout_phis (sese region, htab_t rename_map, basic_block bb,
-			  edge false_e, edge true_e)
-{
-  gimple_stmt_iterator si;
-
-  for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
-    {
-      unsigned i;
-      unsigned false_i = 0;
-      gimple phi = gsi_stmt (si);
-      tree res = gimple_phi_result (phi);
-
-      if (!is_gimple_reg (res))
-	{
-	  sese_adjust_vphi (region, phi, true_e);
-	  continue;
-	}
-
-      for (i = 0; i < gimple_phi_num_args (phi); i++)
-	if (gimple_phi_arg_edge (phi, i) == false_e)
-	  {
-	    false_i = i;
-	    break;
-	  }
-
-      for (i = 0; i < gimple_phi_num_args (phi); i++)
-	if (gimple_phi_arg_edge (phi, i) == true_e)
-	  {
-	    tree old_name = gimple_phi_arg_def (phi, false_i);
-	    tree expr = get_rename (rename_map, old_name);
-	    gimple_seq stmts;
-
-	    gcc_assert (old_name != expr);
-
-	    if (TREE_CODE (expr) != SSA_NAME
-		&& is_gimple_reg (old_name))
-	      {
-		tree type = TREE_TYPE (old_name);
-		tree var = create_tmp_var (type, "var");
-
-		expr = build2 (MODIFY_EXPR, type, var, expr);
-		expr = force_gimple_operand (expr, &stmts, true, NULL);
-		gsi_insert_seq_on_edge_immediate (true_e, stmts);
-	      }
-
-	    SET_PHI_ARG_DEF (phi, i, expr);
-	    set_rename (rename_map, old_name, res);
-	  }
-    }
-}
-
 /* Rename the SSA_NAMEs used in STMT and that appear in MAP.  */
 
 static void
diff --git a/gcc/sese.h b/gcc/sese.h
index 2b05ca8..4b2e5c2 100644
--- a/gcc/sese.h
+++ b/gcc/sese.h
@@ -55,7 +55,6 @@  typedef struct sese_s
 extern sese new_sese (edge, edge);
 extern void free_sese (sese);
 extern void sese_insert_phis_for_liveouts (sese, basic_block, edge, edge);
-extern void sese_adjust_liveout_phis (sese, htab_t, basic_block, edge, edge);
 extern void build_sese_loop_nests (sese);
 extern edge copy_bb_and_scalar_dependences (basic_block, sese, edge, htab_t);
 extern struct loop *outermost_loop_in_sese (sese, basic_block);
-- 
1.7.0.4