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Optimize tuple_slice() and make further improvements to list_slice()

Browse source 
and list.extend().  Factoring the inner loops to remove the constant
structure references and fixed offsets gives speedups ranging from
20% to 30%.
This commit is contained in:
Raymond Hettinger 2004-03-08 07:25:05 +00:00
parent f0e3569a28
commit b7d05db0be
3 changed files with 28 additions and 18 deletions
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13
Objects/tupleobject.c
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@ -306,7 +306,9 @@ static PyObject *
tupleslice(register PyTupleObject *a, register int ilow, register int ihigh)
{
register PyTupleObject *np;
PyObject **src, **dest;
register int i;
int len;
if (ilow < 0)
ilow = 0;
if (ihigh > a->ob_size)
@ -317,13 +319,16 @@ tupleslice(register PyTupleObject *a, register int ilow, register int ihigh)
Py_INCREF(a);
return (PyObject *)a;
}
np = (PyTupleObject *)PyTuple_New(ihigh - ilow);
len = ihigh - ilow;
np = (PyTupleObject *)PyTuple_New(len);
if (np == NULL)
return NULL;
for (i = ilow; i < ihigh; i++) {
PyObject *v = a->ob_item[i];
src = a->ob_item + ilow;
dest = np->ob_item;
for (i = 0; i < len; i++) {
PyObject *v = src[i];
Py_INCREF(v);
np->ob_item[i - ilow] = v;
dest[i] = v;
}
return (PyObject *)np;
}