| commit | effde12f5fe41bab9c27269bd77237200d953afd | [log] [tgz] |
|---|---|---|
| author | Raymond Hettinger <python@rcn.com> | Tue Dec 18 18:26:18 2007 +0000 |
| committer | Raymond Hettinger <python@rcn.com> | Tue Dec 18 18:26:18 2007 +0000 |
| tree | b2eeab007ae8d329366ca815e1f1b3b3072415e9 | |
| parent | eb103b357780ecc9395cc680ebd4f5d436bbe888 [diff] |
Speed-up dictionary constructor by about 10%.
New opcode, STORE_MAP saves the compiler from awkward stack manipulations
and specializes for dicts using PyDict_SetItem instead of PyObject_SetItem.
Old disassembly:
0 BUILD_MAP 0
3 DUP_TOP
4 LOAD_CONST 1 (1)
7 ROT_TWO
8 LOAD_CONST 2 ('x')
11 STORE_SUBSCR
12 DUP_TOP
13 LOAD_CONST 3 (2)
16 ROT_TWO
17 LOAD_CONST 4 ('y')
20 STORE_SUBSCR
New disassembly:
0 BUILD_MAP 0
3 LOAD_CONST 1 (1)
6 LOAD_CONST 2 ('x')
9 STORE_MAP
10 LOAD_CONST 3 (2)
13 LOAD_CONST 4 ('y')
16 STORE_MAP