# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 1398902208 25200
# Node ID b6dc3b79bb2557f3588e7f74b2ba45cf4ea11d4d
# Parent  6e38b5d4997788ee7accf4ab9cd1c8f8d504db7d
revset: avoid in loop lookup in _generatorset._consumegen

Python lookups are slow, so do all lookup outside of the for loop.

This provide a small but still significant speedup:

revset #0: 0::
0) wall 0.063258 comb 0.060000 user 0.060000 sys 0.000000 (best of 100)
1) wall 0.057776 comb 0.050000 user 0.050000 sys 0.000000 (best of 100)

diff -r 6e38b5d49977 -r b6dc3b79bb25 mercurial/revset.py
--- a/mercurial/revset.py	Fri Apr 25 14:51:24 2014 -0700
+++ b/mercurial/revset.py	Wed Apr 30 16:56:48 2014 -0700
@@ -2672,9 +2672,11 @@
             i += 1
 
     def _consumegen(self):
+        cache = self._cache
+        genlist = self._genlist.append
         for item in self._gen:
-            self._cache[item] = True
-            self._genlist.append(item)
+            cache[item] = True
+            genlist(item)
             yield item
         self._finished = True