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Fast path for int inputs to math.dist() and math.hypot() (GH-11692)

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Raymond Hettinger 2019-01-28 13:59:56 -08:00 committed by GitHub
parent ea446409cd
commit 808180c206
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 34 additions and 4 deletions
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11
Lib/test/test_math.py
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@ -766,6 +766,9 @@ class MathTests(unittest.TestCase):
hypot(x=1)
with self.assertRaises(TypeError): # Reject values without __float__
hypot(1.1, 'string', 2.2)
int_too_big_for_float = 10 ** (sys.float_info.max_10_exp + 5)
with self.assertRaises((ValueError, OverflowError)):
hypot(1, int_too_big_for_float)
# Any infinity gives positive infinity.
self.assertEqual(hypot(INF), INF)
@ -805,7 +808,8 @@ class MathTests(unittest.TestCase):
dist = math.dist
sqrt = math.sqrt
# Simple exact case
# Simple exact cases
self.assertEqual(dist((1.0, 2.0, 3.0), (4.0, 2.0, -1.0)), 5.0)
self.assertEqual(dist((1, 2, 3), (4, 2, -1)), 5.0)
# Test different numbers of arguments (from zero to nine)
@ -869,6 +873,11 @@ class MathTests(unittest.TestCase):
dist((1, 2, 3), (4, 5, 6, 7))
with self.assertRaises(TypeError): # Rejects invalid types
dist("abc", "xyz")
int_too_big_for_float = 10 ** (sys.float_info.max_10_exp + 5)
with self.assertRaises((ValueError, OverflowError)):
dist((1, int_too_big_for_float), (2, 3))
with self.assertRaises((ValueError, OverflowError)):
dist((2, 3), (1, int_too_big_for_float))
# Verify that the one dimensional case is equivalent to abs()
for i in range(20):

27
Modules/mathmodule.c
View File

@ -2144,7 +2144,14 @@ math_dist_impl(PyObject *module, PyObject *p, PyObject *q)
item = PyTuple_GET_ITEM(p, i);
if (PyFloat_CheckExact(item)) {
px = PyFloat_AS_DOUBLE(item);
} else {
}
else if (PyLong_CheckExact(item)) {
px = PyLong_AsDouble(item);
if (px == -1.0 && PyErr_Occurred()) {
goto error_exit;
}
}
else {
px = PyFloat_AsDouble(item);
if (px == -1.0 && PyErr_Occurred()) {
goto error_exit;
@ -2153,7 +2160,14 @@ math_dist_impl(PyObject *module, PyObject *p, PyObject *q)
item = PyTuple_GET_ITEM(q, i);
if (PyFloat_CheckExact(item)) {
qx = PyFloat_AS_DOUBLE(item);
} else {
}
else if (PyLong_CheckExact(item)) {
qx = PyLong_AsDouble(item);
if (qx == -1.0 && PyErr_Occurred()) {
goto error_exit;
}
}
else {
qx = PyFloat_AsDouble(item);
if (qx == -1.0 && PyErr_Occurred()) {
goto error_exit;
@ -2201,7 +2215,14 @@ math_hypot(PyObject *self, PyObject *const *args, Py_ssize_t nargs)
item = args[i];
if (PyFloat_CheckExact(item)) {
x = PyFloat_AS_DOUBLE(item);
} else {
}
else if (PyLong_CheckExact(item)) {
x = PyLong_AsDouble(item);
if (x == -1.0 && PyErr_Occurred()) {
goto error_exit;
}
}
else {
x = PyFloat_AsDouble(item);
if (x == -1.0 && PyErr_Occurred()) {
goto error_exit;