re PR middle-end/45379 (~10% slowdown on test_fpu at revision 163278)

2010-08-24  Richard Guenther  <rguenther@suse.de>

	PR middle-end/45379
	* tree-ssa-address.c (create_mem_ref_raw): Drop to MEM_REF
	if addr->index is NULL or zero.
	* tree-ssa-alias.c (indirect_refs_may_alias_p): Handle
	TARGET_MEM_REF more properly.
	(indirect_ref_may_alias_decl_p): Likewise.
	* emit-rtl.c (set_mem_attributes_minus_bitpos): Keep TARGET_MEM_REFs.
	* alias.c (ao_ref_from_mem): Handle TARGET_MEM_REF more
	properly.

From-SVN: r163519

gcc/ChangeLog

+2010-08-24  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/45379
+	* tree-ssa-address.c (create_mem_ref_raw): Drop to MEM_REF
+	if addr->index is NULL or zero.
+	* tree-ssa-alias.c (indirect_refs_may_alias_p): Handle
+	TARGET_MEM_REF more properly.
+	(indirect_ref_may_alias_decl_p): Likewise.
+	* emit-rtl.c (set_mem_attributes_minus_bitpos): Keep TARGET_MEM_REFs.
+	* alias.c (ao_ref_from_mem): Handle TARGET_MEM_REF more
+	properly.
+
 2010-08-23  Anatoly Sokolov  <aesok@post.ru>
 
 	* config/m32c/m32c.c (m32c_function_value_regno_p): Make static.

gcc/alias.c

@@ -283,6 +283,10 @@ ao_ref_from_mem (ao_ref *ref, const_rtx mem)
        || TREE_CODE (base) == MEM_REF)
       && TREE_CODE (TREE_OPERAND (base, 0)) != SSA_NAME)
     return false;
+  if (TREE_CODE (base) == TARGET_MEM_REF
+      && TMR_BASE (base)
+      && TREE_CODE (TMR_BASE (base)) != SSA_NAME)
+    return false;
 
   /* If this is a reference based on a partitioned decl replace the
      base with an INDIRECT_REF of the pointer representative we
@@ -296,6 +300,18 @@ ao_ref_from_mem (ao_ref *ref, const_rtx mem)
       if (namep)
 	ref->base = build_simple_mem_ref (*(tree *)namep);
     }
+  else if (TREE_CODE (base) == TARGET_MEM_REF
+	   && TMR_SYMBOL (base)
+	   && TREE_CODE (TMR_SYMBOL (base)) == VAR_DECL
+	   && ! TREE_STATIC (TMR_SYMBOL (base))
+	   && cfun->gimple_df->decls_to_pointers != NULL)
+    {
+      void *namep;
+      namep = pointer_map_contains (cfun->gimple_df->decls_to_pointers,
+				    TMR_SYMBOL (base));
+      if (namep)
+	ref->base = build_simple_mem_ref (*(tree *)namep);
+    }
 
   ref->ref_alias_set = MEM_ALIAS_SET (mem);
 

gcc/emit-rtl.c

@@ -1788,6 +1788,7 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
 
       /* If this is an indirect reference, record it.  */
       else if (TREE_CODE (t) == MEM_REF 
+	       || TREE_CODE (t) == TARGET_MEM_REF
 	       || TREE_CODE (t) == MISALIGNED_INDIRECT_REF)
 	{
 	  expr = t;

gcc/tree-ssa-address.c

@@ -357,8 +357,7 @@ create_mem_ref_raw (tree type, tree alias_ptr_type, struct mem_address *addr)
 
   /* If possible use a plain MEM_REF instead of a TARGET_MEM_REF.  */
   if (alias_ptr_type
-      && !addr->index
-      && !addr->step
+      && (!addr->index || integer_zerop (addr->index))
       && (!addr->base || POINTER_TYPE_P (TREE_TYPE (addr->base))))
     {
       tree base;

gcc/tree-ssa-alias.c

@@ -672,10 +672,16 @@ indirect_ref_may_alias_decl_p (tree ref1 ATTRIBUTE_UNUSED, tree base1,
 
   if (TREE_CODE (base1) == TARGET_MEM_REF)
     {
-      if (!TMR_BASE (base1)
-	  || !POINTER_TYPE_P (TMR_BASE (base1)))
+      if (TMR_BASE (base1))
+	{
+	  if (!POINTER_TYPE_P (TREE_TYPE (TMR_BASE (base1))))
+	    return true;
+	  ptr1 = TMR_BASE (base1);
+	}
+      else if (TMR_SYMBOL (base1))
+	ptr1 = build_fold_addr_expr (TMR_SYMBOL (base1));
+      else
 	return true;
-      ptr1 = TMR_BASE (base1);
     }
   else
     ptr1 = TREE_OPERAND (base1, 0);
@@ -808,20 +814,32 @@ indirect_refs_may_alias_p (tree ref1 ATTRIBUTE_UNUSED, tree base1,
 
   if (TREE_CODE (base1) == TARGET_MEM_REF)
     {
-      if (!TMR_BASE (base1)
-	  || !POINTER_TYPE_P (TMR_BASE (base1)))
+      if (TMR_BASE (base1))
+	{
+	  if (!POINTER_TYPE_P (TREE_TYPE (TMR_BASE (base1))))
+	    return true;
+	  ptr1 = TMR_BASE (base1);
+	}
+      else if (TMR_SYMBOL (base1))
+	ptr1 = build_fold_addr_expr (TMR_SYMBOL (base1));
+      else
 	return true;
-      ptr1 = TMR_BASE (base1);
     }
   else
     ptr1 = TREE_OPERAND (base1, 0);
 
   if (TREE_CODE (base2) == TARGET_MEM_REF)
     {
-      if (!TMR_BASE (base2)
-	  || !POINTER_TYPE_P (TMR_BASE (base2)))
+      if (TMR_BASE (base2))
+	{
+	  if (!POINTER_TYPE_P (TREE_TYPE (TMR_BASE (base2))))
+	    return true;
+	  ptr2 = TMR_BASE (base2);
+	}
+      else if (TMR_SYMBOL (base2))
+	ptr2 = build_fold_addr_expr (TMR_SYMBOL (base2));
+      else
 	return true;
-      ptr2 = TMR_BASE (base2);
     }
   else
     ptr2 = TREE_OPERAND (base2, 0);