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| author | Joseph Myers <joseph@codesourcery.com> | 2017-12-07 16:21:00 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2017-12-07 16:21:00 +0000 |
| commit | d15e83c5f5231d971472b5ffc9219d54056ca0f1 (patch) | |
| tree | bbc07214991185682fd6fe1dada1907e3fe6608b /math/s_ctanh_template.c | |
| parent | d89756ebe1905c1989179c2f1c2b10ef2fb3354e (diff) | |
| download | glibc-d15e83c5f5231d971472b5ffc9219d54056ca0f1.tar.gz glibc-d15e83c5f5231d971472b5ffc9219d54056ca0f1.tar.xz glibc-d15e83c5f5231d971472b5ffc9219d54056ca0f1.zip | |
Fix ctanh (0 + i NaN), ctanh (0 + i Inf) (bug 22568, DR#471).
As per C11 DR#471, ctanh (0 + i NaN) and ctanh (0 + i Inf) should return 0 + i NaN (with "invalid" exception in the second case but not the first), not NaN + i NaN. This has corresponding implications for ctan since its special cases are defined by ctan (z) = -i ctanh (iz). This patch implements these cases for ctanh and ctan, updating tests accordingly. Tested for x86_64. [BZ #22568] * math/s_ctan_template.c (M_DECL_FUNC (__ctan)): Set imaginary part of result to imaginary part of argument if it is zero and the real part of the argument is not finite. * math/s_ctanh_template.c (M_DECL_FUNC (__ctanh)): Set real part of result to real part of argument if it is zero and the imaginary part of the argument is not finite.
Diffstat (limited to 'math/s_ctanh_template.c')
| -rw-r--r-- | math/s_ctanh_template.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/math/s_ctanh_template.c b/math/s_ctanh_template.c index 96873dd0a3..f237e81511 100644 --- a/math/s_ctanh_template.c +++ b/math/s_ctanh_template.c @@ -48,7 +48,10 @@ M_DECL_FUNC (__ctanh) (CFLOAT x) } else { - __real__ res = M_NAN; + if (__real__ x == 0) + __real__ res = __real__ x; + else + __real__ res = M_NAN; __imag__ res = M_NAN; if (isinf (__imag__ x)) |