# HG changeset patch
# User pacien <pacien.trangirard@pacien.net>
# Date 2022-02-21 15:18:39
# Node ID 6ea9ead59cf8d2f60b2e9bb5843f234e75fd10ea
# Parent  8b8054b8e5a7df019784cdcd6213dc65fc5a2a2b

revlog: use rust rank computation if available

Differential Revision: https://phab.mercurial-scm.org/D12212

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -2471,9 +2471,12 @@ class revlog(object):
             elif p1r == nullrev and p2r != nullrev:
                 rank = 1 + self.fast_rank(p2r)
             else:  # merge node
-                pmin, pmax = sorted((p1r, p2r))
-                rank = 1 + self.fast_rank(pmax)
-                rank += sum(1 for _ in self.findmissingrevs([pmax], [pmin]))
+                if rustdagop is not None and self.index.rust_ext_compat:
+                    rank = rustdagop.rank(self.index, p1r, p2r)
+                else:
+                    pmin, pmax = sorted((p1r, p2r))
+                    rank = 1 + self.fast_rank(pmax)
+                    rank += sum(1 for _ in self.findmissingrevs([pmax], [pmin]))
 
         e = revlogutils.entry(
             flags=flags,