- xpath.c include/libxml/xpath.h include/libxml/xpathInternals.h:

lot of optimization work, results in significant improvements
  when handling really complex XPath queries. Add a small optimizer
  for unions, improve [n] and [last()], avoid some costly ops.
Daniel

ChangeLog

@@ -1,3 +1,10 @@
+Tue Jul  3 10:12:03 CEST 2001 Daniel Veillard <Daniel.Veillard@imag.fr>
+
+	* xpath.c include/libxml/xpath.h include/libxml/xpathInternals.h:
+	  lot of optimization work, results in significant improvements
+	  when handling really complex XPath queries. Add a small optimizer
+	  for unions, improve [n] and [last()], avoid some costly ops.
+
 Fri Jun 29 23:26:54 CEST 2001 Daniel Veillard <Daniel.Veillard@imag.fr>
 
 	* include/libxml/parser.h parser.c: xmlStrstr args are both const

include/libxml/xpath.h

@@ -255,6 +255,7 @@ struct _xmlXPathParserContext {
 
     xmlXPathCompExprPtr comp;		/* the precompiled expression */
     int xptr;				/* it this an XPointer expression */
+    xmlNodePtr         ancestor;	/* used for walking preceding axis */
 };
 
 /**

include/libxml/xpathInternals.h

@@ -74,6 +74,17 @@ extern "C" {
     if ((ctxt->value == NULL) || (ctxt->value->type != typeval))	\
         XP_ERROR(XPATH_INVALID_TYPE)
 
+/**
+ * CHECK_TYPE0:
+ * @typeval:  the XPath type
+ *
+ * Macro to check that the value on top of the XPath stack is of a given
+ * type. return(0) in case of failure
+ */
+#define CHECK_TYPE0(typeval)						\
+    if ((ctxt->value == NULL) || (ctxt->value->type != typeval))	\
+        XP_ERROR0(XPATH_INVALID_TYPE)
+
 /**
  * CHECK_ARITY:
  * @x:  the number of expected args