diff options
| author | Szabolcs Nagy <nsz@port70.net> | 2015-04-21 23:04:11 +0000 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2015-05-01 13:37:42 -0400 |
| commit | b02eed9c4841913d690a2d0029737d72615384fe (patch) | |
| tree | 3309e83aa23e51ce15da864f21742eb296f103bb /src/complex/ctanh.c | |
| parent | e98a54643ee95032baab883673628314e520012e (diff) | |
| download | musl-b02eed9c4841913d690a2d0029737d72615384fe.tar.gz | |
complex: fix ctanh(+-0+i*nan) and ctanh(+-0+-i*inf)
These cases were incorrect in C11 as described by
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1886.htm
Diffstat (limited to 'src/complex/ctanh.c')
| -rw-r--r-- | src/complex/ctanh.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/complex/ctanh.c b/src/complex/ctanh.c index 0461050d..3ba3a899 100644 --- a/src/complex/ctanh.c +++ b/src/complex/ctanh.c @@ -101,11 +101,13 @@ double complex ctanh(double complex z) } /* + * ctanh(+-0 + i NAN) = +-0 + i NaN + * ctanh(+-0 +- i Inf) = +-0 + i NaN * ctanh(x + i NAN) = NaN + i NaN * ctanh(x +- i Inf) = NaN + i NaN */ if (!isfinite(y)) - return CMPLX(y - y, y - y); + return CMPLX(x ? y - y : x, y - y); /* * ctanh(+-huge + i +-y) ~= +-1 +- i 2sin(2y)/exp(2x), using the |