Mercurial > cpython-lru_cache-weakref
view Python/getcompiler.c @ 44334:07aa19170a67 legacy-trunk
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
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Tue, 18 Dec 2007 18:26:18 +0000 |
| parents | 4306107b1395 |
| children |
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/* Return the compiler identification, if possible. */ #include "Python.h" #ifndef COMPILER #ifdef __GNUC__ #define COMPILER "\n[GCC " __VERSION__ "]" #endif #endif /* !COMPILER */ #ifndef COMPILER #ifdef __cplusplus #define COMPILER "[C++]" #else #define COMPILER "[C]" #endif #endif /* !COMPILER */ const char * Py_GetCompiler(void) { return COMPILER; }
