Author: Armin Rigo <[email protected]>
Branch:
Changeset: r74940:5fc98f5c2d94
Date: 2014-12-15 15:46 +0000
http://bitbucket.org/pypy/pypy/changeset/5fc98f5c2d94/
Log: Add a performance hack: llop.gc_writebarrier
diff --git a/rpython/rtyper/lltypesystem/rordereddict.py
b/rpython/rtyper/lltypesystem/rordereddict.py
--- a/rpython/rtyper/lltypesystem/rordereddict.py
+++ b/rpython/rtyper/lltypesystem/rordereddict.py
@@ -605,6 +605,10 @@
newitems = lltype.malloc(lltype.typeOf(d).TO.entries.TO, new_allocated)
else:
newitems = d.entries
+ # The loop below does a lot of writes into 'newitems'. It's a better
+ # idea to do a single gc_writebarrier rather than activating the
+ # card-by-card logic (worth 11% in microbenchmarks).
+ llop.gc_writebarrier(lltype.Void, newitems)
#
ENTRIES = lltype.typeOf(d).TO.entries.TO
ENTRY = ENTRIES.OF
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