Joshua Landau added the comment:
No, that happens in CALL_FUNCTION_KW:
>>> import dis
>>> dis.dis("f(x=1, **{'x': 1})")
1 0 LOAD_NAME 0 (f)
3 LOAD_CONST 0 ('x')
6 LOAD_CONST 1 (1)
9 LOAD_CONST 1 (1)
12 LOAD_CONST 0 ('x')
15 BUILD_MAP 1
18 CALL_FUNCTION_KW 256 (0 positional, 1 keyword pair)
21 RETURN_VALUE
There's no call to BUILD_MAP_UNPACK at all. Namely, it's raised from
update_keyword_args (in turn from ext_do_call).
--- Tangential note: ---
In fact, it seems the only reason we keep the mess of unpacking in two places
rather than just using BUILD_TUPLE_UNPACK and BUILD_MAP_UNPACK unconditionally
is that CALL_FUNCTION_XXX looks to be slightly more efficient by only dealing
with the case of a single unpack at the end. I think I see how to make the
_UNPACKs fast enough for this case, though, so maybe we could remove it and
unify a few things. I'd need to write it up, though.
----------
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<http://bugs.python.org/issue2292>
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