From: Joseph Myers <joseph@codesourcery.com>
Date: Wed, 29 Nov 2006 12:49:06 +0000 (+0000)
Subject: rs6000.c (rs6000_gimplify_va_arg): If STRICT_ALIGNMENT and the type is more aligned... 
X-Git-Tag: releases/gcc-4.3.0~8235
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0cfbc62b0b8697c3e248295cd076e91cd890926c;p=thirdparty%2Fgcc.git

rs6000.c (rs6000_gimplify_va_arg): If STRICT_ALIGNMENT and the type is more aligned than the saved registers...

	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): If
	STRICT_ALIGNMENT and the type is more aligned than the saved
	registers, copy via a temporary.

From-SVN: r119307
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c838be7693a6..0c02f8bede58 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2006-11-29  Joseph Myers  <joseph@codesourcery.com>
+
+	* config/rs6000/rs6000.c (rs6000_gimplify_va_arg): If
+	STRICT_ALIGNMENT and the type is more aligned than the saved
+	registers, copy via a temporary.
+
 2006-11-28  Andrew Pinski  <pinskia@gmail.com>
 
 	PR tree-opt/29984
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index d52a75951c3f..675af68fe9a3 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -6222,6 +6222,27 @@ rs6000_gimplify_va_arg (tree valist, tree type, tree *pre_p, tree *post_p)
       append_to_statement_list (t, pre_p);
     }
 
+  if (STRICT_ALIGNMENT
+      && (TYPE_ALIGN (type)
+	  > (unsigned) BITS_PER_UNIT * (align < 4 ? 4 : align)))
+    {
+      /* The value (of type complex double, for example) may not be
+	 aligned in memory in the saved registers, so copy via a
+	 temporary.  (This is the same code as used for SPARC.)  */
+      tree tmp = create_tmp_var (type, "va_arg_tmp");
+      tree dest_addr = build_fold_addr_expr (tmp);
+
+      tree copy = build_function_call_expr
+	(implicit_built_in_decls[BUILT_IN_MEMCPY],
+	 tree_cons (NULL_TREE, dest_addr,
+		    tree_cons (NULL_TREE, addr,
+			       tree_cons (NULL_TREE, size_int (rsize * 4),
+					  NULL_TREE))));
+
+      gimplify_and_add (copy, pre_p);
+      addr = dest_addr;
+    }
+
   addr = fold_convert (ptrtype, addr);
   return build_va_arg_indirect_ref (addr);
 }