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bpo-35719: Optimize multi-argument math functions. (GH-11527) 

Use the fast call convention for math functions atan2(),
copysign(), hypot() and remainder() and inline unpacking
arguments. This sped up them by 1.3--2.5 times.
This commit is contained in:
Serhiy Storchaka 2019-01-12 08:26:34 +02:00 committed by GitHub
parent 7934266875
commit d0d3e99120
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 19 deletions
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2
Misc/NEWS.d/next/Library/2019-01-11-20-21-59.bpo-35719.qyRcpE.rst Normal file
View File

@ -0,0 +1,2 @@
Sped up multi-argument :mod:`math` functions atan2(), copysign(),
remainder() and hypot() by 1.3--2.5 times.

37
Modules/mathmodule.c
View File

@ -997,14 +997,14 @@ math_1_to_int(PyObject *arg, double (*func) (double), int can_overflow)
}
static PyObject *
math_2(PyObject *args, double (*func) (double, double), const char *funcname)
math_2(PyObject *const *args, Py_ssize_t nargs,
double (*func) (double, double), const char *funcname)
{
PyObject *ox, *oy;
double x, y, r;
if (! PyArg_UnpackTuple(args, funcname, 2, 2, &ox, &oy))
if (!_PyArg_CheckPositional(funcname, nargs, 2, 2))
return NULL;
x = PyFloat_AsDouble(ox);
y = PyFloat_AsDouble(oy);
x = PyFloat_AsDouble(args[0]);
y = PyFloat_AsDouble(args[1]);
if ((x == -1.0 || y == -1.0) && PyErr_Occurred())
return NULL;
errno = 0;
@ -1042,8 +1042,8 @@ math_2(PyObject *args, double (*func) (double, double), const char *funcname)
PyDoc_STRVAR(math_##funcname##_doc, docstring);
#define FUNC2(funcname, func, docstring) \
static PyObject * math_##funcname(PyObject *self, PyObject *args) { \
return math_2(args, func, #funcname); \
static PyObject * math_##funcname(PyObject *self, PyObject *const *args, Py_ssize_t nargs) { \
return math_2(args, nargs, func, #funcname); \
}\
PyDoc_STRVAR(math_##funcname##_doc, docstring);
@ -2181,9 +2181,9 @@ math_dist_impl(PyObject *module, PyObject *p, PyObject *q)
/* AC: cannot convert yet, waiting for *args support */
static PyObject *
math_hypot(PyObject *self, PyObject *args)
math_hypot(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
{
Py_ssize_t i, n;
Py_ssize_t i;
PyObject *item;
double max = 0.0;
double x, result;
@ -2191,15 +2191,14 @@ math_hypot(PyObject *self, PyObject *args)
double coord_on_stack[NUM_STACK_ELEMS];
double *coordinates = coord_on_stack;
n = PyTuple_GET_SIZE(args);
if (n > NUM_STACK_ELEMS) {
coordinates = (double *) PyObject_Malloc(n * sizeof(double));
if (nargs > NUM_STACK_ELEMS) {
coordinates = (double *) PyObject_Malloc(nargs * sizeof(double));
if (coordinates == NULL) {
return PyErr_NoMemory();
}
}
for (i=0 ; i<n ; i++) {
item = PyTuple_GET_ITEM(args, i);
for (i = 0; i < nargs; i++) {
item = args[i];
if (PyFloat_CheckExact(item)) {
x = PyFloat_AS_DOUBLE(item);
} else {
@ -2215,7 +2214,7 @@ math_hypot(PyObject *self, PyObject *args)
max = x;
}
}
result = vector_norm(n, coordinates, max, found_nan);
result = vector_norm(nargs, coordinates, max, found_nan);
if (coordinates != coord_on_stack) {
PyObject_Free(coordinates);
}
@ -2497,10 +2496,10 @@ static PyMethodDef math_methods[] = {
{"asin", math_asin, METH_O, math_asin_doc},
{"asinh", math_asinh, METH_O, math_asinh_doc},
{"atan", math_atan, METH_O, math_atan_doc},
{"atan2", math_atan2, METH_VARARGS, math_atan2_doc},
{"atan2", (PyCFunction)(void(*)(void))math_atan2, METH_FASTCALL, math_atan2_doc},
{"atanh", math_atanh, METH_O, math_atanh_doc},
MATH_CEIL_METHODDEF
{"copysign", math_copysign, METH_VARARGS, math_copysign_doc},
{"copysign", (PyCFunction)(void(*)(void))math_copysign, METH_FASTCALL, math_copysign_doc},
{"cos", math_cos, METH_O, math_cos_doc},
{"cosh", math_cosh, METH_O, math_cosh_doc},
MATH_DEGREES_METHODDEF
@ -2517,7 +2516,7 @@ static PyMethodDef math_methods[] = {
MATH_FSUM_METHODDEF
{"gamma", math_gamma, METH_O, math_gamma_doc},
MATH_GCD_METHODDEF
{"hypot", math_hypot, METH_VARARGS, math_hypot_doc},
{"hypot", (PyCFunction)(void(*)(void))math_hypot, METH_FASTCALL, math_hypot_doc},
MATH_ISCLOSE_METHODDEF
MATH_ISFINITE_METHODDEF
MATH_ISINF_METHODDEF
@ -2531,7 +2530,7 @@ static PyMethodDef math_methods[] = {
MATH_MODF_METHODDEF
MATH_POW_METHODDEF
MATH_RADIANS_METHODDEF
{"remainder", math_remainder, METH_VARARGS, math_remainder_doc},
{"remainder", (PyCFunction)(void(*)(void))math_remainder, METH_FASTCALL, math_remainder_doc},
{"sin", math_sin, METH_O, math_sin_doc},
{"sinh", math_sinh, METH_O, math_sinh_doc},
{"sqrt", math_sqrt, METH_O, math_sqrt_doc},