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Faster floating point allocator, same idea as the int allocator. 

By Aaron Watters.
This commit is contained in:
Guido van Rossum 1997-05-13 21:00:42 +00:00
parent 0609f191bc
commit 93ad0df06c
1 changed files with 29 additions and 7 deletions
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36
Objects/floatobject.c
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@ -83,6 +83,25 @@ extern double fmod Py_PROTO((double, double));
extern double pow Py_PROTO((double, double));
#endif
/* Special free list -- see comments for same code in intobject.c. */
static PyFloatObject *free_list = NULL;
#define BLOCK_SIZE 1000 /* 1K less typical malloc overhead */
#define N_FLOATOBJECTS (BLOCK_SIZE / sizeof(PyFloatObject))
static PyFloatObject *
fill_free_list()
{
PyFloatObject *p, *q;
p = PyMem_NEW(PyFloatObject, N_FLOATOBJECTS);
if (p == NULL)
return (PyFloatObject *)PyErr_NoMemory();
q = p + N_FLOATOBJECTS;
while (--q > p)
*(PyFloatObject **)q = q-1;
*(PyFloatObject **)q = NULL;
return p + N_FLOATOBJECTS - 1;
}
PyObject *
#ifdef __SC__
PyFloat_FromDouble(double fval)
@ -91,11 +110,13 @@ PyFloat_FromDouble(fval)
double fval;
#endif
{
/* For efficiency, this code is copied from newobject() */
register PyFloatObject *op =
(PyFloatObject *) malloc(sizeof(PyFloatObject));
if (op == NULL)
return PyErr_NoMemory();
register PyFloatObject *op;
if (free_list == NULL) {
if ((free_list = fill_free_list()) == NULL)
return NULL;
}
op = free_list;
free_list = *(PyFloatObject **)free_list;
op->ob_type = &PyFloat_Type;
op->ob_fval = fval;
_Py_NewReference(op);
@ -104,9 +125,10 @@ PyFloat_FromDouble(fval)
static void
float_dealloc(op)
PyObject *op;
PyFloatObject *op;
{
PyMem_DEL(op);
*(PyFloatObject **)op = free_list;
free_list = op;
}
double