tree-flow.h (addressable_vars): Declare.

	* tree-flow.h (addressable_vars): Declare.
	* tree-ssa-alias.c (addressable_vars): Define.
	(setup_pointers_and_addressables): Add addressable variables
	to addressable_vars.
	* tree-ssa-operands.c (get_stmt_operands): Move
	handling of ASM_EXPRs ...
	(get_asm_expr_operands): ... here.
	When the ASM_EXPR clobbers memory, also clobber addressable
	variables.
	* tree-ssa.c (init_tree_ssa): Initialize addressable_vars.
	(delete_tree_ssa): Reset addressable_vars.

From-SVN: r84272

gcc/ChangeLog

+2004-07-08  Diego Novillo  <dnovillo@redhat.com>
+
+	* tree-flow.h (addressable_vars): Declare.
+	* tree-ssa-alias.c (addressable_vars): Define.
+	(setup_pointers_and_addressables): Add addressable variables
+	to addressable_vars.
+	* tree-ssa-operands.c (get_stmt_operands): Move
+	handling of ASM_EXPRs ...
+	(get_asm_expr_operands): ... here.
+	When the ASM_EXPR clobbers memory, also clobber addressable
+	variables.
+	* tree-ssa.c (init_tree_ssa): Initialize addressable_vars.
+	(delete_tree_ssa): Reset addressable_vars.
+
 2004-07-07  Jan Beulich  <jbeulich@novell.com>
 	    Richard Henderson  <rth@redhat.com>
 

gcc/tree-flow.h

@@ -395,6 +395,10 @@ extern GTY(()) tree global_var;
    REFERENCED_VARS (I) is call-clobbered.  */
 extern bitmap call_clobbered_vars;
 
+/* Addressable variables in the function.  If bit I is set, then
+   REFERENCED_VARS (I) has had its address taken.  */
+extern bitmap addressable_vars;
+
 /* 'true' after aliases have been computed (see compute_may_aliases).  */
 extern bool aliases_computed_p;
 

gcc/tree-ssa-alias.c

@@ -163,6 +163,10 @@ static struct ptr_info_def *get_ptr_info (tree t);
    REFERENCED_VARS (I) is call-clobbered.  */
 bitmap call_clobbered_vars;
 
+/* Addressable variables in the function.  If bit I is set, then
+   REFERENCED_VARS (I) has had its address taken.  */
+bitmap addressable_vars;
+
 /* 'true' after aliases have been computed (see compute_may_aliases).  This
    is used by get_stmt_operands and its helpers to determine what to do
    when scanning an operand for a variable that may be aliased.  If
@@ -1196,6 +1200,14 @@ setup_pointers_and_addressables (struct alias_info *ai)
 		 to rename VAR into SSA afterwards.  */
 	      bitmap_set_bit (vars_to_rename, v_ann->uid);
 	    }
+	  else
+	    {
+	      /* Add the variable to the set of addressables.  Mostly
+		 used when scanning operands for ASM_EXPRs that
+		 clobber memory.  In those cases, we need to clobber
+		 all call-clobbered variables and all addressables.  */
+	      bitmap_set_bit (addressable_vars, v_ann->uid);
+	    }
 	}
 
       /* Global variables and addressable locals may be aliased.  Create an

gcc/tree-ssa-operands.c

@@ -80,6 +80,7 @@ typedef struct voperands_d
 
 static void note_addressable (tree, stmt_ann_t);
 static void get_expr_operands (tree, tree *, int, voperands_t);
+static void get_asm_expr_operands (tree, voperands_t);
 static inline void append_def (tree *, tree);
 static inline void append_use (tree *, tree);
 static void append_v_may_def (tree, tree, voperands_t);
@@ -777,59 +778,7 @@ get_stmt_operands (tree stmt)
       break;
 
     case ASM_EXPR:
-      {
-	int noutputs = list_length (ASM_OUTPUTS (stmt));
-	const char **oconstraints
-	  = (const char **) alloca ((noutputs) * sizeof (const char *));
-	int i;
-	tree link;
-	const char *constraint;
-	bool allows_mem, allows_reg, is_inout;
-
-	for (i=0, link = ASM_OUTPUTS (stmt); link;
-	     ++i, link = TREE_CHAIN (link))
-	  {
-	    oconstraints[i] = constraint
-	      = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
-	    parse_output_constraint (&constraint, i, 0, 0,
-				     &allows_mem, &allows_reg, &is_inout);
-	    if (allows_reg && is_inout)
-	      /* This should have been split in gimplify_asm_expr.  */
-	      abort ();
-
-	    if (!allows_reg && allows_mem)
-	      {
-		tree t = get_base_address (TREE_VALUE (link));
-		if (t && DECL_P (t))
-		  mark_call_clobbered (t);
-	      }
-
-	    get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def,
-			       &prev_vops);
-	  }
-
-	for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
-	  {
-	    constraint
-	      = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
-	    parse_input_constraint (&constraint, 0, 0, noutputs, 0,
-				    oconstraints, &allows_mem, &allows_reg);
-
-	    if (!allows_reg && allows_mem)
-	      {
-		tree t = get_base_address (TREE_VALUE (link));
-		if (t && DECL_P (t))
-		  mark_call_clobbered (t);
-	      }
-
-	    get_expr_operands (stmt, &TREE_VALUE (link), 0, &prev_vops);
-	  }
-
-	/* Clobber memory for asm ("" : : : "memory");  */
-	for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
-	  if (!strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory"))
-	    add_call_clobber_ops (stmt, &prev_vops);
-      }
+      get_asm_expr_operands (stmt, &prev_vops);
       break;
 
     case RETURN_EXPR:
@@ -1215,6 +1164,108 @@ get_expr_operands (tree stmt, tree *expr_p, int flags, voperands_t prev_vops)
   abort ();
 }
 
+/* Scan operands in ASM_EXPR STMT.  PREV_VOPS is as in
+   append_v_may_def and append_vuse.  */
+
+static void
+get_asm_expr_operands (tree stmt, voperands_t prev_vops)
+{
+  int noutputs = list_length (ASM_OUTPUTS (stmt));
+  const char **oconstraints
+    = (const char **) alloca ((noutputs) * sizeof (const char *));
+  int i;
+  tree link;
+  const char *constraint;
+  bool allows_mem, allows_reg, is_inout;
+  stmt_ann_t s_ann = stmt_ann (stmt);
+
+  for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
+    {
+      oconstraints[i] = constraint
+	= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+      parse_output_constraint (&constraint, i, 0, 0,
+	  &allows_mem, &allows_reg, &is_inout);
+
+#if defined ENABLE_CHECKING
+      /* This should have been split in gimplify_asm_expr.  */
+      if (allows_reg && is_inout)
+	abort ();
+#endif
+
+      /* Memory operands are addressable.  Note that STMT needs the
+	 address of this operand.  */
+      if (!allows_reg && allows_mem)
+	{
+	  tree t = get_base_address (TREE_VALUE (link));
+	  if (t && DECL_P (t))
+	    note_addressable (t, s_ann);
+	}
+
+      get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def, prev_vops);
+    }
+
+  for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
+    {
+      constraint
+	= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+      parse_input_constraint (&constraint, 0, 0, noutputs, 0,
+	  oconstraints, &allows_mem, &allows_reg);
+
+      /* Memory operands are addressable.  Note that STMT needs the
+	 address of this operand.  */
+      if (!allows_reg && allows_mem)
+	{
+	  tree t = get_base_address (TREE_VALUE (link));
+	  if (t && DECL_P (t))
+	    note_addressable (t, s_ann);
+	}
+
+      get_expr_operands (stmt, &TREE_VALUE (link), 0, prev_vops);
+    }
+
+  /* Clobber memory for asm ("" : : : "memory");  */
+  if (!aliases_computed_p)
+    {
+      /* If we still have not computed aliasing information,
+	 mark the statement as having volatile operands to avoid
+	 optimizations from messing around with it.  */
+      stmt_ann (stmt)->has_volatile_ops = true;
+    }
+  else
+    {
+      /* Otherwise, if this ASM_EXPR clobbers memory, clobber
+	 all the call-clobbered variables and the addressable
+	 variables found by the alias analyzer.  */
+      for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
+	if (!strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory"))
+	  {
+	    /* If we had created .GLOBAL_VAR earlier, use it.
+	       Otherwise, add a V_MAY_DEF operand for every
+	       call-clobbered and addressable variable.  See
+	       compute_may_aliases for the heuristic used to decide
+	       whether to create .GLOBAL_VAR or not.  */
+	    if (global_var)
+	      add_stmt_operand (&global_var, stmt, opf_is_def, prev_vops);
+	    else
+	      {
+		size_t i;
+
+		EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i,
+		    {
+		      tree var = referenced_var (i);
+		      add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
+		    });
+
+		EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 0, i,
+		    {
+		      tree var = referenced_var (i);
+		      add_stmt_operand (&var, stmt, opf_is_def, prev_vops);
+		    });
+	      }
+	  }
+    }
+}
+
 
 /* Add *VAR_P to the appropriate operand array of STMT.  FLAGS is as in
    get_expr_operands.  If *VAR_P is a GIMPLE register, it will be added to

gcc/tree-ssa.c

@@ -494,6 +494,7 @@ init_tree_ssa (void)
 {
   VARRAY_TREE_INIT (referenced_vars, 20, "referenced_vars");
   call_clobbered_vars = BITMAP_XMALLOC ();
+  addressable_vars = BITMAP_XMALLOC ();
   init_ssa_operands ();
   init_ssanames ();
   init_phinodes ();
@@ -532,6 +533,8 @@ delete_tree_ssa (void)
   BITMAP_XFREE (call_clobbered_vars);
   call_clobbered_vars = NULL;
   aliases_computed_p = false;
+  BITMAP_XFREE (addressable_vars);
+  addressable_vars = NULL;
 }