mirror of git://git.musl-libc.org/musl
math: support invalid ld80 representations in fpclassify
apparently gnulib requires invalid long double representations to be handled correctly in printf so we classify them according to how the fpu treats them: bad inf is nan, bad nan is nan, bad normal is nan and bad subnormal/zero is minimal normal
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@ -3,13 +3,15 @@
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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/* invalid representations (top bit of u.i.m is wrong) are not handled */
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int __fpclassifyl(long double x)
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{
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union ldshape u = {x};
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int e = u.i.se & 0x7fff;
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if (!e)
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int msb = u.i.m>>63;
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if (!e && !msb)
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return u.i.m ? FP_SUBNORMAL : FP_ZERO;
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if (!msb)
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return FP_NAN;
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if (e == 0x7fff)
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return u.i.m << 1 ? FP_NAN : FP_INFINITE;
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return FP_NORMAL;
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