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Speed-up dictionary constructor by about 10%.

Browse source 
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
This commit is contained in:
Raymond Hettinger 2007-12-18 18:26:18 +00:00
parent eb103b3577
commit effde12f5f
5 changed files with 19 additions and 5 deletions
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1
Include/opcode.h
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@ -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