diff options
Diffstat (limited to 'src/math/acosh.c')
| -rw-r--r-- | src/math/acosh.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/math/acosh.c b/src/math/acosh.c index aeb15816..f557c875 100644 --- a/src/math/acosh.c +++ b/src/math/acosh.c @@ -1,9 +1,23 @@ # define TGSOURCE "acosh.c" #include "_tgmath.h" #include <math.h> +#include "fenv.h" TYPE TGFN(acosh)(TYPE x) { + if (x == 1.0) { + return 0.0; + } + + if (x < 1.0) { + feraiseexcept(FE_INVALID); + return NAN; + } + + if (fpclassify(x) == FP_INFINITE && !signbit(x)) { + return x; + } + return x; } |