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| author | Raymond Hettinger <python@rcn.com> | 2007-12-18 18:26:18 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2007-12-18 18:26:18 (GMT) |
| commit | effde12f5fe41bab9c27269bd77237200d953afd (patch) | |
| tree | b2eeab007ae8d329366ca815e1f1b3b3072415e9 /Include | |
| parent | eb103b357780ecc9395cc680ebd4f5d436bbe888 (diff) | |
| download | cpython-effde12f5fe41bab9c27269bd77237200d953afd.zip cpython-effde12f5fe41bab9c27269bd77237200d953afd.tar.gz cpython-effde12f5fe41bab9c27269bd77237200d953afd.tar.bz2 | |
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
Diffstat (limited to 'Include')
| -rw-r--r-- | Include/opcode.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Include/opcode.h b/Include/opcode.h index 2816369..9f20b56 100644 --- a/Include/opcode.h +++ b/Include/opcode.h @@ -45,6 +45,7 @@ extern "C" { #define DELETE_SLICE 50 /* Also uses 51-53 */ +#define STORE_MAP 54 #define INPLACE_ADD 55 #define INPLACE_SUBTRACT 56 #define INPLACE_MULTIPLY 57 |