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-rw-r--r--src/math/__fpclassifyl.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/src/math/__fpclassifyl.c b/src/math/__fpclassifyl.c
index a5ad36f2..e4d231b5 100644
--- a/src/math/__fpclassifyl.c
+++ b/src/math/__fpclassifyl.c
@@ -7,8 +7,11 @@ int __fpclassifyl(long double x)
{
union ldshape u = { x };
int e = u.bits.exp;
- if (!e)
- return u.bits.m ? FP_SUBNORMAL : FP_ZERO;
+ if (!e) {
+ if (u.bits.m >> 63) return FP_NAN;
+ else if (u.bits.m) return FP_SUBNORMAL;
+ else return FP_ZERO;
+ }
if (e == 0x7fff)
return u.bits.m & (uint64_t)-1>>1 ? FP_NAN : FP_INFINITE;
return u.bits.m & (uint64_t)1<<63 ? FP_NORMAL : FP_NAN;