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gh-121268: remove workarounds for non-IEEE 754 systems in cmath #122716

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Merged
vstinner merged 2 commits into from
Aug 9, 2024
Merged

gh-121268: remove workarounds for non-IEEE 754 systems in cmath #122716

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gh-121268: remove workarounds for non-IEEE 754 systems in cmath
skirpichev Jul 17, 2024
470a59d
Merge branch 'main' into drop-cmath-legacy-121268
skirpichev Aug 6, 2024
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1 change: 1 addition & 0 deletions 1 Misc/NEWS.d/next/Library/2024-07-17-12-55-22.gh-issue-121268.41RmjR.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Remove workarounds for non-IEEE 754 systems in :mod:`cmath`.
17 changes: 3 additions & 14 deletions 17 Modules/cmathmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -386,11 +379,7 @@ 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 */
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