STINNER Victor added the comment:

fastcalldict-4.patch: Rebased patch.

kw1: Median +- std dev: [ref] 290 ns +- 3 ns -> [patch] 253 ns +- 21 ns: 1.14x 
faster (-13%)
kw5: Median +- std dev: [ref] 438 ns +- 33 ns -> [patch] 394 ns +- 27 ns: 1.11x 
faster (-10%)
kw10: Median +- std dev: [ref] 663 ns +- 14 ns -> [patch] 617 ns +- 16 ns: 
1.07x faster (-7%)

This patch still always allocated 10 pointers (80 bytes) on the C stack: see 
issue #28870 which discuss options to use less memory.

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Added file: http://bugs.python.org/file46118/fastcalldict-4.patch

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<http://bugs.python.org/issue28839>
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