Commit df0ba264 authored by Kasimier T. Buchcik's avatar Kasimier T. Buchcik

Optimized xmlXPathNodeCollectAndTest() and xmlXPathNodeCollectAndTestNth()

* xpath.c: Optimized xmlXPathNodeCollectAndTest() and
  xmlXPathNodeCollectAndTestNth() to evaluate a compound
  traversal of 2 axes when we have a "//foo" expression.
  This is done with a rewrite of the XPath AST in
  xmlXPathRewriteDOSExpression(); I added an additional field
  to xmlXPathStepOp for this (but the field's name should be
  changed). The mechanism: the embracing descendant-or-self
  axis traversal (also optimized to return only nodes which
  can hold elements), will produce context nodes for the
  inner traversal of the child axis. This way we avoid a full
  node-collecting traversal of the descendant-or-self axis.
  Some tests indicate that this can reduce execution time of
  "//foo" to 50%. Together with the XPath object cache this
  all significantly speeds up libxslt.
parent e5f810f6
Tue May 30 21:36:16 CEST 2006 Kasimier Buchcik <libxml2-cvs@cazic.net>
* xpath.c: Optimized xmlXPathNodeCollectAndTest() and
xmlXPathNodeCollectAndTestNth() to evaluate a compound
traversal of 2 axes when we have a "//foo" expression.
This is done with a rewrite of the XPath AST in
xmlXPathRewriteDOSExpression(); I added an additional field
to xmlXPathStepOp for this (but the field's name should be
changed). The mechanism: the embracing descendant-or-self
axis traversal (also optimized to return only nodes which
can hold elements), will produce context nodes for the
inner traversal of the child axis. This way we avoid a full
node-collecting traversal of the descendant-or-self axis.
Some tests indicate that this can reduce execution time of
"//foo" to 50%. Together with the XPath object cache this
all significantly speeds up libxslt.
Tue May 30 11:38:47 CEST 2006 Kasimier Buchcik <libxml2-cvs@cazic.net>
* xmlschemas.c: A warning will now be reported in the value of
......
This diff is collapsed.
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment