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support ld80 pseudo-denormal invalid bit patterns; treat them as nan

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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...
This commit is contained in:
Rich Felker 2012-06-20 15:15:10 -04:00
commit fad231b960
1 changed files with 5 additions and 2 deletions
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7
src/math/__fpclassifyl.c
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@ -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;