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Small code improvements for readability, code size, and/or speed.

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BINARY_SUBSCR:
    * invert test for normal case fall through
    * eliminate err handling code by jumping to slow_case

LOAD_LOCALS:
    * invert test for normal case fall through
    * continue instead of break for the non-error case

STORE_NAME and DELETE_NAME:
    * invert test for normal case fall through

LOAD_NAME:
    * continue instead of break for the non-error case

DELETE_FAST:
    * invert test for normal case fall through

LOAD_DEREF:
    * invert test for normal case fall through
    * continue instead of break for the non-error case
This commit is contained in:
Raymond Hettinger 2004-04-07 11:39:21 +00:00
parent 22ab06e4de
commit 467a698bd2
1 changed files with 55 additions and 59 deletions
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60
Python/ceval.c
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@ -1155,18 +1155,15 @@ eval_frame(PyFrameObject *f)
long i = PyInt_AsLong(w); long i = PyInt_AsLong(w);
if (i < 0) if (i < 0)
i += PyList_GET_SIZE(v); i += PyList_GET_SIZE(v);
if (i < 0 || if (i >= 0 && i < PyList_GET_SIZE(v)) {
i >= PyList_GET_SIZE(v)) {
PyErr_SetString(PyExc_IndexError,
"list index out of range");
x = NULL;
}
else {
x = PyList_GET_ITEM(v, i); x = PyList_GET_ITEM(v, i);
Py_INCREF(x); Py_INCREF(x);
} }
else
goto slow_get;
} }
else else
slow_get:
x = PyObject_GetItem(v, w); x = PyObject_GetItem(v, w);
Py_DECREF(v); Py_DECREF(v);
Py_DECREF(w); Py_DECREF(w);
@ -1608,13 +1605,12 @@ eval_frame(PyFrameObject *f)
break; break;
case LOAD_LOCALS: case LOAD_LOCALS:
if ((x = f->f_locals) == NULL) { if ((x = f->f_locals) != NULL) {
PyErr_SetString(PyExc_SystemError,
"no locals");
break;
}
Py_INCREF(x); Py_INCREF(x);
PUSH(x); PUSH(x);
continue;
}
PyErr_SetString(PyExc_SystemError, "no locals");
break; break;
case RETURN_VALUE: case RETURN_VALUE:
@ -1687,28 +1683,28 @@ eval_frame(PyFrameObject *f)
case STORE_NAME: case STORE_NAME:
w = GETITEM(names, oparg); w = GETITEM(names, oparg);
v = POP(); v = POP();
if ((x = f->f_locals) == NULL) { if ((x = f->f_locals) != NULL) {
err = PyDict_SetItem(x, w, v);
Py_DECREF(v);
break;
}
PyErr_Format(PyExc_SystemError, PyErr_Format(PyExc_SystemError,
"no locals found when storing %s", "no locals found when storing %s",
PyObject_REPR(w)); PyObject_REPR(w));
break; break;
}
err = PyDict_SetItem(x, w, v);
Py_DECREF(v);
break;
case DELETE_NAME: case DELETE_NAME:
w = GETITEM(names, oparg); w = GETITEM(names, oparg);
if ((x = f->f_locals) == NULL) { if ((x = f->f_locals) != NULL) {
PyErr_Format(PyExc_SystemError,
"no locals when deleting %s",
PyObject_REPR(w));
break;
}
if ((err = PyDict_DelItem(x, w)) != 0) if ((err = PyDict_DelItem(x, w)) != 0)
format_exc_check_arg(PyExc_NameError, format_exc_check_arg(PyExc_NameError,
NAME_ERROR_MSG ,w); NAME_ERROR_MSG ,w);
break; break;
}
PyErr_Format(PyExc_SystemError,
"no locals when deleting %s",
PyObject_REPR(w));
break;
PREDICTED_WITH_ARG(UNPACK_SEQUENCE); PREDICTED_WITH_ARG(UNPACK_SEQUENCE);
case UNPACK_SEQUENCE: case UNPACK_SEQUENCE:
@ -1794,7 +1790,7 @@ eval_frame(PyFrameObject *f)
} }
Py_INCREF(x); Py_INCREF(x);
PUSH(x); PUSH(x);
break; continue;
case LOAD_GLOBAL: case LOAD_GLOBAL:
w = GETITEM(names, oparg); w = GETITEM(names, oparg);
@ -1840,16 +1836,16 @@ eval_frame(PyFrameObject *f)
case DELETE_FAST: case DELETE_FAST:
x = GETLOCAL(oparg); x = GETLOCAL(oparg);
if (x == NULL) { if (x != NULL) {
SETLOCAL(oparg, NULL);
continue;
}
format_exc_check_arg( format_exc_check_arg(
PyExc_UnboundLocalError, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG, UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(co->co_varnames, oparg) PyTuple_GetItem(co->co_varnames, oparg)
); );
break; break;
}
SETLOCAL(oparg, NULL);
continue;
case LOAD_CLOSURE: case LOAD_CLOSURE:
x = freevars[oparg]; x = freevars[oparg];
@ -1860,7 +1856,10 @@ eval_frame(PyFrameObject *f)
case LOAD_DEREF: case LOAD_DEREF:
x = freevars[oparg]; x = freevars[oparg];
w = PyCell_Get(x); w = PyCell_Get(x);
if (w == NULL) { if (w != NULL) {
PUSH(w);
continue;
}
err = -1; err = -1;
/* Don't stomp existing exception */ /* Don't stomp existing exception */
if (PyErr_Occurred()) if (PyErr_Occurred())
@ -1882,9 +1881,6 @@ eval_frame(PyFrameObject *f)
v); v);
} }
break; break;
}
PUSH(w);
break;
case STORE_DEREF: case STORE_DEREF:
w = POP(); w = POP();