1 files changed, 15 insertions, 0 deletions
diff --git a/src/math/atanh.c b/src/math/atanh.c
index eef1cfc6..bfd4e57b 100644
--- a/src/math/atanh.c
+++ b/src/math/atanh.c
@@ -1,9 +1,24 @@
 # define TGSOURCE "atanh.c"
 #include "_tgmath.h"
 #include <math.h>
+#include "fenv.h"
 
 TYPE TGFN(atanh)(TYPE x)
 {
+	if (fpclassify(x) == FP_ZERO) {
+		return x;
+	}
+
+	if (TGFN(fabs)(x) == 1.0) {
+		feraiseexcept(FE_DIVBYZERO);
+		return copysign(INFINITY, x);
+	}
+
+	if (TGFN(fabs)(x) > 1.0) {
+		feraiseexcept(FE_INVALID);
+		return NAN;
+	}
+
 	return x;
 }