implement in terms of fpclassify()

1 files changed, 1 insertions, 6 deletions

diff --git a/src/math/isnan.c b/src/math/isnan.c
index 963b7021..e3e0160a 100644
--- a/src/math/isnan.c
+++ b/src/math/isnan.c
@@ -1,10 +1,5 @@
 #include <math.h>
-                             int __isnanf(float x);
-                            int __isnand(double x);
-                       int __isnanl(long double x);
-
-#define isnan(x)              ((sizeof (x) == sizeof (float)) ? __isnanf(x) : \
-	(sizeof (x) == sizeof (double)) ? __isnand(x) : __isnanl(x))
+#define isnan(x)                                       (fpclassify(x) == FP_NAN)
 
 /*
 STDC(199901)