ancestor: use heapreplace() in place of heappop/heappush()
This should be slightly faster.
Overall perfancestors result::
cpython nginx mercurial
------------- ---------------- ---------------- ----------------
b6db2e80a9ce^ 0.103461 0.006303 0.035716
8eb2145ff0fb 0.192307 (x1.86) 0.012115 (x1.92) 0.052135 (x1.46)
this patch 0.139986 (x1.35) 0.006389 (x1.01) 0.037176 (x1.04)
--- a/mercurial/ancestor.py Tue Sep 11 22:36:51 2018 +0900
+++ b/mercurial/ancestor.py Mon Sep 10 22:34:19 2018 +0900
@@ -264,6 +264,7 @@
seen = {nullrev}
heappush = heapq.heappush
heappop = heapq.heappop
+ heapreplace = heapq.heapreplace
see = seen.add
if inclusive:
@@ -294,8 +295,7 @@
if current - p1 == 1:
visit[0] = -p1
else:
- heappop(visit)
- heappush(visit, -p1)
+ heapreplace(visit, -p1)
see(p1)
else:
heappop(visit)