From: Mark Mitchell <mmitchel@gcc.gnu.org>
Date: Fri, 29 Dec 2000 06:09:44 +0000 (+0000)
Subject: Add comment
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7e7d95175604e98bd3d23134f6d708d87a66b5ed;p=gcc.git

Add comment

From-SVN: r38525
---

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 29047d7306b..cc18eef4ac9 100644
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -3962,10 +3962,14 @@ lookup_template_class (d1, arglist, in_decl, context, entering_scope)
 	if (comp_template_args (TREE_PURPOSE (*tp), arglist))
 	  {
 	    found = *tp;
+
+	    /* Use the move-to-front heuristic to speed up future
+	       searches.  */
 	    *tp = TREE_CHAIN (*tp);
 	    TREE_CHAIN (found) 
 	      = DECL_TEMPLATE_INSTANTIATIONS (template);
 	    DECL_TEMPLATE_INSTANTIATIONS (template) = found;
+
 	    return TREE_VALUE (found);
 	  }