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gh-121889: cmath.acosh(0+nanj) returns nan+pi/2j (#121892)

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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 +
iNaN) should return NaN ± i pi/2, not NaN + iNaN.  This patch
fixes cmath's code to do same.
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Sergey B Kirpichev 2024-08-04 11:53:17 +03:00 committed by GitHub
parent 151934a324
commit 3462a80d2c
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3 changed files with 5 additions and 4 deletions
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4
Lib/test/mathdata/cmath_testcases.txt
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@ -371,9 +371,9 @@ acosh1002 acosh 0.0 inf -> inf 1.5707963267948966
acosh1003 acosh 2.3 inf -> inf 1.5707963267948966
acosh1004 acosh -0.0 inf -> inf 1.5707963267948966
acosh1005 acosh -2.3 inf -> inf 1.5707963267948966
acosh1006 acosh 0.0 nan -> nan nan
acosh1006 acosh 0.0 nan -> nan 1.5707963267948966 ignore-imag-sign
acosh1007 acosh 2.3 nan -> nan nan
acosh1008 acosh -0.0 nan -> nan nan
acosh1008 acosh -0.0 nan -> nan 1.5707963267948966 ignore-imag-sign
acosh1009 acosh -2.3 nan -> nan nan
acosh1010 acosh -inf 0.0 -> inf 3.1415926535897931
acosh1011 acosh -inf 2.3 -> inf 3.1415926535897931

1
Misc/NEWS.d/next/Library/2024-07-17-09-23-03.gh-issue-121889.6se9jS.rst Normal file
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@ -0,0 +1 @@
Adjusts ``cmath.acosh(complex('0+nanj'))`` for recent C standards.

4
Modules/cmathmodule.c
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@ -1259,8 +1259,8 @@ cmath_exec(PyObject *mod)
INIT_SPECIAL_VALUES(acosh_special_values, {
C(INF,-P34) C(INF,-P) C(INF,-P) C(INF,P) C(INF,P) C(INF,P34) C(INF,N)
C(INF,-P12) C(U,U) C(U,U) C(U,U) C(U,U) C(INF,P12) C(N,N)
C(INF,-P12) C(U,U) C(0.,-P12) C(0.,P12) C(U,U) C(INF,P12) C(N,N)
C(INF,-P12) C(U,U) C(0.,-P12) C(0.,P12) C(U,U) C(INF,P12) C(N,N)
C(INF,-P12) C(U,U) C(0.,-P12) C(0.,P12) C(U,U) C(INF,P12) C(N,P12)
C(INF,-P12) C(U,U) C(0.,-P12) C(0.,P12) C(U,U) C(INF,P12) C(N,P12)
C(INF,-P12) C(U,U) C(U,U) C(U,U) C(U,U) C(INF,P12) C(N,N)
C(INF,-P14) C(INF,-0.) C(INF,-0.) C(INF,0.) C(INF,0.) C(INF,P14) C(INF,N)
C(INF,N) C(N,N) C(N,N) C(N,N) C(N,N) C(INF,N) C(N,N)