Mercurial > cpython-lru_cache-weakref

comparison Python/import.c @ 44334:07aa19170a67 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 803edf9b1dd9
children 0cbe94bea2c7
comparison
equal deleted inserted replaced
44333:56f342c84e87 44334:07aa19170a67
64 Python 2.5b3: 62101 (fix wrong code: for x, in ...) 64 Python 2.5b3: 62101 (fix wrong code: for x, in ...)
65 Python 2.5b3: 62111 (fix wrong code: x += yield) 65 Python 2.5b3: 62111 (fix wrong code: x += yield)
66 Python 2.5c1: 62121 (fix wrong lnotab with for loops and 66 Python 2.5c1: 62121 (fix wrong lnotab with for loops and
67 storing constants that should have been removed) 67 storing constants that should have been removed)
68 Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp) 68 Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp)
69 Python 2.6a0: 62141 (peephole optimizations) 69 Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode)
70 . 70 .
71 */ 71 */
72 #define MAGIC (62141 | ((long)'\r'<<16) | ((long)'\n'<<24)) 72 #define MAGIC (62151 | ((long)'\r'<<16) | ((long)'\n'<<24))
73 73
74 /* Magic word as global; note that _PyImport_Init() can change the 74 /* Magic word as global; note that _PyImport_Init() can change the
75 value of this global to accommodate for alterations of how the 75 value of this global to accommodate for alterations of how the
76 compiler works which are enabled by command line switches. */ 76 compiler works which are enabled by command line switches. */
77 static long pyc_magic = MAGIC; 77 static long pyc_magic = MAGIC;