Merged revisions 67818 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r67818 | antoine.pitrou | 2008-12-17 01:38:28 +0100 (mer., 17 déc. 2008) | 3 lines
Issue #2183: Simplify and optimize bytecode for list comprehensions.
........
diff --git a/Python/ceval.c b/Python/ceval.c
index b17d3db..2ce3ec9 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -1306,9 +1306,8 @@
case LIST_APPEND:
w = POP();
- v = POP();
+ v = stack_pointer[-oparg];
err = PyList_Append(v, w);
- Py_DECREF(v);
Py_DECREF(w);
if (err == 0) {
PREDICT(JUMP_ABSOLUTE);
@@ -1318,9 +1317,8 @@
case SET_ADD:
w = POP();
- v = POP();
+ v = stack_pointer[-oparg];
err = PySet_Add(v, w);
- Py_DECREF(v);
Py_DECREF(w);
if (err == 0) {
PREDICT(JUMP_ABSOLUTE);
@@ -1935,6 +1933,21 @@
if (err == 0) continue;
break;
+ case MAP_ADD:
+ w = TOP(); /* key */
+ u = SECOND(); /* value */
+ STACKADJ(-2);
+ v = stack_pointer[-oparg]; /* dict */
+ assert (PyDict_CheckExact(v));
+ err = PyDict_SetItem(v, w, u); /* v[w] = u */
+ Py_DECREF(u);
+ Py_DECREF(w);
+ if (err == 0) {
+ PREDICT(JUMP_ABSOLUTE);
+ continue;
+ }
+ break;
+
case LOAD_ATTR:
w = GETITEM(names, oparg);
v = TOP();
diff --git a/Python/compile.c b/Python/compile.c
index 50eb169..36f8c13 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -707,6 +707,8 @@
case SET_ADD:
case LIST_APPEND:
+ return -1;
+ case MAP_ADD:
return -2;
case BINARY_POWER:
@@ -2823,7 +2825,7 @@
*/
static int
-compiler_comprehension_generator(struct compiler *c, PyObject *tmpname,
+compiler_comprehension_generator(struct compiler *c,
asdl_seq *generators, int gen_index,
expr_ty elt, expr_ty val, int type)
{
@@ -2871,7 +2873,7 @@
}
if (++gen_index < asdl_seq_LEN(generators))
- if (!compiler_comprehension_generator(c, tmpname,
+ if (!compiler_comprehension_generator(c,
generators, gen_index,
elt, val, type))
return 0;
@@ -2886,27 +2888,19 @@
ADDOP(c, POP_TOP);
break;
case COMP_LISTCOMP:
- if (!compiler_nameop(c, tmpname, Load))
- return 0;
VISIT(c, expr, elt);
- ADDOP(c, LIST_APPEND);
+ ADDOP_I(c, LIST_APPEND, gen_index + 1);
break;
case COMP_SETCOMP:
- if (!compiler_nameop(c, tmpname, Load))
- return 0;
VISIT(c, expr, elt);
- ADDOP(c, SET_ADD);
+ ADDOP_I(c, SET_ADD, gen_index + 1);
break;
case COMP_DICTCOMP:
- if (!compiler_nameop(c, tmpname, Load))
- return 0;
/* With 'd[k] = v', v is evaluated before k, so we do
- the same. STORE_SUBSCR requires (item, map, key),
- so we still end up ROTing once. */
+ the same. */
VISIT(c, expr, val);
- ADDOP(c, ROT_TWO);
VISIT(c, expr, elt);
- ADDOP(c, STORE_SUBSCR);
+ ADDOP_I(c, MAP_ADD, gen_index + 1);
break;
default:
return 0;
@@ -2932,7 +2926,6 @@
asdl_seq *generators, expr_ty elt, expr_ty val)
{
PyCodeObject *co = NULL;
- identifier tmp = NULL;
expr_ty outermost_iter;
outermost_iter = ((comprehension_ty)
@@ -2943,9 +2936,6 @@
if (type != COMP_GENEXP) {
int op;
- tmp = compiler_new_tmpname(c);
- if (!tmp)
- goto error_in_scope;
switch (type) {
case COMP_LISTCOMP:
op = BUILD_LIST;
@@ -2963,12 +2953,9 @@
}
ADDOP_I(c, op, 0);
- ADDOP(c, DUP_TOP);
- if (!compiler_nameop(c, tmp, Store))
- goto error_in_scope;
}
- if (!compiler_comprehension_generator(c, tmp, generators, 0, elt,
+ if (!compiler_comprehension_generator(c, generators, 0, elt,
val, type))
goto error_in_scope;
@@ -2984,7 +2971,6 @@
if (!compiler_make_closure(c, co, 0))
goto error;
Py_DECREF(co);
- Py_XDECREF(tmp);
VISIT(c, expr, outermost_iter);
ADDOP(c, GET_ITER);
@@ -2994,7 +2980,6 @@
compiler_exit_scope(c);
error:
Py_XDECREF(co);
- Py_XDECREF(tmp);
return 0;
}
diff --git a/Python/import.c b/Python/import.c
index 2bad2e5..621284e 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -87,8 +87,10 @@
3102 (__file__ points to source file)
Python 3.0a4: 3110 (WITH_CLEANUP optimization).
Python 3.0a5: 3130 (lexical exception stacking, including POP_EXCEPT)
+ Python 3.1a0: 3140 (optimize list, set and dict comprehensions:
+ change LIST_APPEND and SET_ADD, add MAP_ADD)
*/
-#define MAGIC (3130 | ((long)'\r'<<16) | ((long)'\n'<<24))
+#define MAGIC (3140 | ((long)'\r'<<16) | ((long)'\n'<<24))
/* Magic word as global; note that _PyImport_Init() can change the
value of this global to accommodate for alterations of how the