emit-rtl.c (set_mem_attributes): Preserve indirection of PARM_DECL when flag_argument_noalias == 2.

        * emit-rtl.c (set_mem_attributes): Preserve indirection of PARM_DECL
        when flag_argument_noalias == 2.
        * alias.c (nonoverlapping_memrefs_p): Handle that.
        * print-rtl.c (print_mem_expr): Likewise.

From-SVN: r55633

gcc/ChangeLog

+2002-07-21  Richard Henderson  <rth@redhat.com>
+
+	* emit-rtl.c (set_mem_attributes): Preserve indirection of PARM_DECL
+	when flag_argument_noalias == 2.
+	* alias.c (nonoverlapping_memrefs_p): Handle that.
+	* print-rtl.c (print_mem_expr): Likewise.
+
 2002-07-21  Hartmut Schirmer  <hartmut.schirmer@arcor.de>
 
 	* libgcc2.c (__divdi3, __moddi3): Use unary minus operator

gcc/alias.c

@@ -1957,6 +1957,14 @@ nonoverlapping_memrefs_p (x, y)
       moffsetx = adjust_offset_for_component_ref (exprx, moffsetx);
       exprx = t;
     }
+  else if (TREE_CODE (exprx) == INDIRECT_REF)
+    {
+      exprx = TREE_OPERAND (exprx, 0);
+      if (flag_argument_noalias < 2
+	  || TREE_CODE (exprx) != PARM_DECL)
+	return 0;
+    }
+
   moffsety = MEM_OFFSET (y);
   if (TREE_CODE (expry) == COMPONENT_REF)
     {
@@ -1966,6 +1974,13 @@ nonoverlapping_memrefs_p (x, y)
       moffsety = adjust_offset_for_component_ref (expry, moffsety);
       expry = t;
     }
+  else if (TREE_CODE (expry) == INDIRECT_REF)
+    {
+      expry = TREE_OPERAND (expry, 0);
+      if (flag_argument_noalias < 2
+	  || TREE_CODE (expry) != PARM_DECL)
+	return 0;
+    }
 
   if (! DECL_P (exprx) || ! DECL_P (expry))
     return 0;

gcc/emit-rtl.c

@@ -1805,7 +1805,17 @@ set_mem_attributes (ref, t, objectp)
 	    }
 	  while (TREE_CODE (t) == ARRAY_REF);
 
-	  if (TREE_CODE (t) == COMPONENT_REF)
+	  if (DECL_P (t))
+	    {
+	      expr = t;
+	      if (host_integerp (off_tree, 1))
+		offset = GEN_INT (tree_low_cst (off_tree, 1));
+	      size = (DECL_SIZE_UNIT (t)
+		      && host_integerp (DECL_SIZE_UNIT (t), 1)
+		      ? GEN_INT (tree_low_cst (DECL_SIZE_UNIT (t), 1)) : 0);
+	      align = DECL_ALIGN (t);
+	    }
+	  else if (TREE_CODE (t) == COMPONENT_REF)
 	    {
 	      expr = component_ref_for_mem_expr (t);
 	      if (host_integerp (off_tree, 1))
@@ -1813,6 +1823,23 @@ set_mem_attributes (ref, t, objectp)
 	      /* ??? Any reason the field size would be different than
 		 the size we got from the type?  */
 	    }
+	  else if (flag_argument_noalias > 1
+		   && TREE_CODE (t) == INDIRECT_REF
+		   && TREE_CODE (TREE_OPERAND (t, 0)) == PARM_DECL)
+	    {
+	      expr = t;
+	      offset = NULL;
+	    }
+	}
+
+      /* If this is a Fortran indirect argument reference, record the
+	 parameter decl.  */
+      else if (flag_argument_noalias > 1
+	       && TREE_CODE (t) == INDIRECT_REF
+	       && TREE_CODE (TREE_OPERAND (t, 0)) == PARM_DECL)
+	{
+	  expr = t;
+	  offset = NULL;
 	}
     }
 

gcc/print-rtl.c

@@ -92,6 +92,12 @@ print_mem_expr (outfile, expr)
 	fprintf (outfile, ".%s",
 		 IDENTIFIER_POINTER (DECL_NAME (TREE_OPERAND (expr, 1))));
     }
+  else if (TREE_CODE (expr) == INDIRECT_REF)
+    {
+      fputs (" (*", outfile);
+      print_mem_expr (outfile, TREE_OPERAND (expr, 0));
+      fputs (")", outfile);
+    }
   else if (DECL_NAME (expr))
     fprintf (outfile, " %s", IDENTIFIER_POINTER (DECL_NAME (expr)));
   else if (TREE_CODE (expr) == RESULT_DECL)