Mercurial > cpython-lru_cache-weakref
diff Python/compile.c @ 31618:bc006682acb2 legacy-trunk
SF patch #910929: Optimize list comprehensions
Add a new opcode, LIST_APPEND, and apply it to the code generation for
list comprehensions. Reduces the per-loop overhead by about a third.
| author | Raymond Hettinger <python@rcn.com> |
|---|---|
| date | Sun, 07 Mar 2004 07:31:06 +0000 |
| parents | 9c846c3df6f3 |
| children | 6509354e7876 |
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--- a/Python/compile.c Fri Mar 05 14:33:21 2004 +0000 +++ b/Python/compile.c Sun Mar 07 07:31:06 2004 +0000 @@ -1552,8 +1552,7 @@ com_addop_varname(c, VAR_LOAD, t); com_push(c, 1); com_node(c, e); - com_addoparg(c, CALL_FUNCTION, 1); - com_addbyte(c, POP_TOP); + com_addbyte(c, LIST_APPEND); com_pop(c, 2); } } @@ -1569,7 +1568,6 @@ com_addoparg(c, BUILD_LIST, 0); com_addbyte(c, DUP_TOP); /* leave the result on the stack */ com_push(c, 2); - com_addop_name(c, LOAD_ATTR, "append"); com_addop_varname(c, VAR_STORE, tmpname); com_pop(c, 1); com_list_for(c, CHILD(n, 1), CHILD(n, 0), tmpname);