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authorRich Felker <dalias@aerifal.cx>2012-06-20 15:15:10 -0400
committerRich Felker <dalias@aerifal.cx>2012-06-20 15:15:10 -0400
commitfad231b9609470e4c51b29b6bcb9abd23b7e9346 (patch)
tree22223311b6373b4a5f493ffc0892df05daeed54e
parentc21a19d5a559cbd39963b89547900d24624f1fad (diff)
downloadmusl-fad231b9609470e4c51b29b6bcb9abd23b7e9346.tar.gz
support ld80 pseudo-denormal invalid bit patterns; treat them as nan
this is silly, but it makes apps that read binary junk and interpret it as ld80 "safer", and it gets gnulib to stop replacing printf...
-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;