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gh-121268: Remove workarounds for non-IEEE 754 systems in cmath (#122716)

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As now building Python now requires support of IEEE 754 floating point
numbers.
This commit is contained in:
Sergey B Kirpichev 2024-08-09 12:17:40 +03:00 committed by GitHub
parent 2f5c3b09e4
commit b6e745a27e
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GPG key ID: B5690EEEBB952194
2 changed files with 4 additions and 14 deletions
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1
Misc/NEWS.d/next/Library/2024-07-17-12-55-22.gh-issue-121268.41RmjR.rst Normal file
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@ -0,0 +1 @@
Remove workarounds for non-IEEE 754 systems in :mod:`cmath`.

17
Modules/cmathmodule.c
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@ -185,15 +185,8 @@ cmath_acos_impl(PyObject *module, Py_complex z)
if (fabs(z.real) > CM_LARGE_DOUBLE || fabs(z.imag) > CM_LARGE_DOUBLE) {
/* avoid unnecessary overflow for large arguments */
r.real = atan2(fabs(z.imag), z.real);
/* split into cases to make sure that the branch cut has the
correct continuity on systems with unsigned zeros */
if (z.real < 0.) {
r.imag = -copysign(log(hypot(z.real/2., z.imag/2.)) +
M_LN2*2., z.imag);
} else {
r.imag = copysign(log(hypot(z.real/2., z.imag/2.)) +
M_LN2*2., -z.imag);
}
r.imag = -copysign(log(hypot(z.real/2., z.imag/2.)) +
M_LN2*2., z.imag);
} else {
s1.real = 1.-z.real;
s1.imag = -z.imag;
@ -356,11 +349,7 @@ cmath_atanh_impl(PyObject *module, Py_complex z)
*/
h = hypot(z.real/2., z.imag/2.); /* safe from overflow */
r.real = z.real/4./h/h;
/* the two negations in the next line cancel each other out
except when working with unsigned zeros: they're there to
ensure that the branch cut has the correct continuity on
systems that don't support signed zeros */
r.imag = -copysign(Py_MATH_PI/2., -z.imag);
r.imag = copysign(Py_MATH_PI/2., z.imag);
errno = 0;
} else if (z.real == 1. && ay < CM_SQRT_DBL_MIN) {
/* C99 standard says: atanh(1+/-0.) should be inf +/- 0i */